KR20020024324A - Buckle device - Google Patents

Abstract

The present invention relates to a buckle device capable of reliably preventing a detachment of a blade plate (2) from a buckle body (5) by the operation of a pretensioner and simplifying a structure for realizing it, The locking lever 100 is rotatable between a locked position in which the locking lever 100 can not be disengaged unlockably and an unlocked position in which it can not be disengaged and the locking lever 100 is constantly biased toward the unlocked position by the torsion spring 105, Is rotatably pivotally moved with respect to the frame 10 with the eccentric shafts 104 interposed therebetween at the center G thereof so that the lock lever 100 is pivoted immediately after the buckle body 5 starts to move in operation of the pretensioner, When the buckle body 5 is suddenly stopped, the locking bar 30 receives the inertial force and moves to the second position to be unlocked at the locking position of the locking lever 100 It suppresses the rotation of the value. In addition, the present invention can reduce the impact noise generated when inserting the wing plate (2), and can simplify the structure by omitting the coil spring member and the locking pin holder for applying the force to the release button (50) The buckle main body 5 includes the frame 10 and the hook member 20 and the locking bar 30 and the ejector 40 and the release button 50 and the coil spring 5 The locking bars 30 are attached to the pair of side plate portions 12 by being inserted into the elongated holes 16 at both ends of the locking bars 30 so that the locking bars 30 Are engaged with the pair of guide grooves 54 of the pair of guide wall portions 52 of the release button made of a synthetic resin so that the locking bar 30 is inserted into the slot 16 when the blade plate 2 is inserted. The end portion of the locking bar 30 is moved to the front end portion of the guide groove 54 at the end portion of the guide groove 54, 5).

Description

Buckle device {BUCKLE DEVICE}

A buckle device having a buckle body having a buckle body into which a buckle is inserted and detached is disclosed as a prior art relating to a seat belt device mounted on a vehicle. The buckle device includes a buckle plate movably mounted on an intermediate part of a seat belt, And the buckle device according to the prior art fixes the seat belt mounted on the occupant so as to be releasably and reliably released on the vehicle body side.

Japanese Unexamined Utility Model Publication No. 6-66315 discloses a conventional buckle body having a frame made of metal and a frame which is mounted or supported on the frame so as to be rotatable or oscillatable so as to be connected / A locking pin made of metal for locking or unlocking the rotation of the hook member and the hook member as possible, a lock pin holder for holding the locking pin, A spring member for applying a force to the ejector and a biasing member for biasing the biasing member in the same direction as the direction in which the blade is pulled out by the coil spring. A release button for releasing the blade plate by applying a force in the direction of the guide plate, a base cover made of synthetic resin, and a lid cover.

The frame disclosed in the above-mentioned prior art has a base portion and a pair of side plate parts erected on the base portion, and a pair of long holes are formed on the pair of side plate portions , And the locking pin is inserted into the elongated hole and attached to the pair of side plate portions. When the blade plate is inserted, when the hook member is rotated by engaging an ejector with the blade plate to engage with the blade plate, the locking pin is urged by the biasing force of the urging member to the first position Thereby restraining rotation of the hook member in the direction in which the engagement of the hook member is released, thereby holding the blade plate and the hook member in the engaged state.

Since the hook member according to the related art described above is always urged to rotate in the disengaging direction, when releasing the coupling between the blade plate and the hook member to release the blade plate, the release button So that the locking pin is switched from the first position to the second position, and the hook member is rotated in the direction in which the hook member is disengaged to release the blade plate.

On the other hand, the buckle device disclosed in Japanese Utility Model Publication No. 6-66311 discloses a buckle main body as a basic structure; A hook member which is swingably supported on the buckle main body so that the hook member can be switched between a coupled state and a non-coupled state with respect to a tongue plate; A locking pin supported by the buckle body and movable between a first position for holding the hook member in the engaged state and a second position for releasing the engaged state; And a release button for biasing the blade plate in a direction in which the blade plate is withdrawn by a coil spring.

Further, in the above-described buckle device of the Japanese Patent Publication, a safety belt is brought into close contact with a buckle body in an urgent situation so that the lock lever can freely rotate near the lock pin so that the pretensioner can be pulled in the close- . When the blade plate is inserted, a rotational force is applied to the locked position by the rotational urging member to move and hold the locking pin to the first position, and when the blade plate is released, the locking lever is locked to the non- position so as to move the locking pin to the second position.

In the vicinity of the lock lever, there is provided a plate-shaped inertia member which is guided and supported movably in the approaching or separating direction with respect to the lock lever, and is always applied with a force by the spring member in the isolating direction.

When the buckle main body is pulled in the direction in which the seat belt is tightly adhered by the pretensioner operating at the time of a vehicle emergency, the inertial body moves to the locking lever side against the urging force of the supporting spring member, Thereby preventing the locking lever from rotating toward the non-locking position. That is, the locking pin is rotated to the non-locking position to disengage the hook member to prevent the knocker plate from being detached from the buckle main body.

Furthermore, the buckle device disclosed in Japanese Patent Application Laid-Open No. 4-58963 includes a wing plate; A latch member capable of being connected and disconnected; An operation member for releasing the engagement of the latch member; A locking member for moving the latch member in conjunction with the operation of the operating member and moving to the releasing position to engage or disengage the latch member and a lock mechanism for preventing disengagement of the latch member are provided.

The locking mechanism is provided with a motion restricting member (motion restriction member), which is pivotally pivoted freely with respect to the operating member and partially intervenes with a region where the locking member moves, The locking member moving while the part of the regulating member exists in the moving region is prevented from moving to the releasing position of the locking member in contact with the movement regulating member.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a buckle device provided in a seat belt device of a vehicle, and more particularly to a buckle device which reduces collision noise between metal parts when a tongue plate is inserted and simplifies the structure . Further, the present invention relates to a buckle device having a buckle body and a wing plate, and more particularly, a buckle device which improves the structure so that the buckle plate does not come off from the buckle body in an emergency situation of a vehicle. Further, the present invention relates to a buckle device configured such that a buckle body does not come off from a buckle body when a buckle body moves in a close-contact direction by a pretensioner in a vehicle emergency situation.

1 is an exploded perspective view showing an embodiment of a buckle device according to the first invention of the present application.

Fig. 2 is a longitudinal perspective view showing a part of a buckle device according to the first invention of the present application while being cut away. Fig.

3 is a longitudinal side view of the buckle device according to the first invention of the present application.

4 is a view showing the guide wall portion of the release button and the recessed side face of the guide groove or the like.

5 is a longitudinal side view of the buckle device according to the first invention of the present application (a state in which the wheel plate and the hook member are engaged).

6 is a longitudinal side view (release button pressing operation state) of the buckle device according to the first invention of the present application.

7 is a longitudinal side view of the buckle device according to the first invention of the present application (a state in which a kick plate is released or a state in which a kick plate is inserted).

8 is a view showing important sides of the guide wall portion and the guide groove of the release button.

Fig. 9 is a side elevational side elevational view of a lid cover and a release button in a buckle device according to the first invention of the first aspect related to the modification. Fig.

10 is an exploded perspective view showing an embodiment of the buckle device according to the second invention of the present application.

11 is a longitudinal perspective view showing a part of a buckle device according to the second invention of the present application while being cut away.

12 is a longitudinal side view of the buckle device according to the second invention of the present application.

Fig. 13 is a longitudinal side view of a buckle device according to the second invention of the present application (a state in which a wing plate is not inserted); Fig.

Fig. 14 is a longitudinal side view of the buckle device (at the time of inserting the blade plate) according to the second invention of the present application.

Fig. 15 is a longitudinal side view of a buckle device according to the second invention of the present application (a state in which a wing plate is inserted). Fig.

16 is a longitudinal side view of the buckle device (when the buckle body is in a sudden stop state) according to the second invention of the present application.

17 is an enlarged view of a locking member and a locking bar.

18 is an exploded perspective view showing an embodiment of a buckle device according to the third invention of the present application.

19 is a longitudinal sectional perspective view showing a part of a buckle device according to the third invention of the present application.

20 is a longitudinal side view of the buckle device according to the third invention of the present application.

Fig. 21 is a longitudinal side view of a buckle device according to the third invention of the present application (a state in which a wing plate is not inserted); Fig.

22 is a longitudinal side view of a buckle device (a wing plate inserted state) according to the third invention of the present application.

23 is a longitudinal side view of the buckle device (immediately after the buckle body starts to move) according to the third invention of the present application.

24 is a longitudinal side view of the buckle device (when the buckle body is in a sudden stop state) according to the third invention of the present application.

25 is a longitudinal side view of a buckle device (a state in which a wing plate is not inserted) according to another embodiment of the third invention of the present application.

Fig. 26 is a longitudinal side view of a buckle device (a state in which a wing plate is inserted) according to the third invention of the present application; Fig.

27 is a longitudinal side view of the buckle device (immediately after the buckle body starts to move) according to the third invention of the present application.

28 is a longitudinal side view of a buckle device (when the buckle body is in a sudden stop state) according to the third invention of the present application.

Description of the Related Art

1, 1A: buckle device

2: a tongue plate

5: buckle body (buckle body)

10: frame

16: long hole

18: stopper part

20: hook member

30: Lock bar

40: ejector

43: Operation part

44: pushing part

50: release button

52: guiding part

54, 54A: guide groove

54a: an opening opening part

55: receiving part

57: engaged part

60, 61, 70, 71: coil spring

80: first lever

86: second lever

90: lock member

93: first engaging part < RTI ID = 0.0 >

94: second engaging part < RTI ID = 0.0 >

96, 105: torsion spring

100: Lock lever

102b, 87b: a contact part,

102c, 87c: an inclined guide part,

104: axial member

110: spring mounting hole (spring mounting hole)

However, in the buckle device disclosed in Japanese Unexamined Patent Publication No. 6-66315, when the locking pin is moved to the first position by the urging force of the urging member and stops at the end of the pair of slots, There is a problem that the locking pin collides with the metal frame and high impact sound is generated.

Further, in the buckle device according to the related art, since a pin bar of a round bar is used as a locking pin, a synthetic resin material locking pin holder having a complicated structure must be provided in order to hold the locking pin, The number of parts (members) increases, which complicates the structure. As a result, the assembling process of the buckle device becomes complicated.

Further, in the buckle device according to the related art, in addition to the spring member that applies the force in the direction in which the ejector leaves the blade plate, the coil spring member applies the force in the same direction as the release direction of the release button to the blade plate, It is necessary to provide the coil spring member and the pair of spring receiving portions for supporting the coil spring member. As a result, the number of members increases, which complicates the structure and makes it difficult to assemble the buckle device.

In addition, in the buckle device disclosed in Japanese Utility Model Laid-Open No. 6-66311, a lock lever and an inertia body are provided so that when the vehicle is urgently stopped after the buckle body is pulled in by the pretensioner in an emergency in a vehicle, the inertia body receives the inertia force The locking pin is moved to the locking lever side and comes into contact with the locking lever to restrain the rotation of the locking lever to the non-locking position and keep the locking pin in the first position. However, when the buckle main body makes a sudden stop, inertial force acts on the locking pin, As a locking lever, the strong load is applied from the locking pin to the locking lever.

Therefore, there may be a problem that the locking pin or the locking lever is damaged or deformed and the locking pin does not return to the normal state after moving to the second position. In order to solve such a problem, it is necessary to use a high-rigidity material having high rigidity for a locking pin, a locking lever, etc., resulting in a disadvantage in manufacturing cost.

In addition, in order to prevent the release plate from being detached from the buckle body by the operation of the pretensioner, a locking lever, an inertial member, and a biasing member for applying a force to each member must be provided. The assembly of the buckle device is also complicated, resulting in an increase in manufacturing cost.

In addition, when the tongue plate is inserted, the locking lever presses the locking pin to the first position, but the inclined portion of the rotating locking lever contacts the locking pin to transmit the force, There is also a possibility that it can not be realized.

Further, in the buckle device disclosed in Japanese Utility Model Laid-Open Publication No. 6-66311, when the buckle body is suddenly stopped, the inertia body moves to the locked lever side, but all the inertia force acting on the locking pin is shifted to the second position So that the locking pin can move to the second position at a high speed. As a result, there is a risk that the lock lever will rotate at a considerable speed toward the unlocked position, so that the inertia starting from the moment the buckle body makes a sudden stop does not normally bring the lock lever in contact with the lock lever, There is a great risk that it can not be suppressed.

Furthermore, according to the buckle device disclosed in Japanese Patent Application Laid-Open No. 4-58963, in the normal state, a part of the movement regulating member is interposed in the movement locus of the locking member, but the movement regulating portion also rotates due to a vehicle collision or the like , There is a risk that the locking member may not contact the movement restricting portion while a part of the movement restricting portion exists in the moving region. When such a situation occurs, the latch member is disengaged and the knurling plate is disengaged.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to reduce the impact sound of a locking pin and a frame generated at the time of inserting a blade plate and to simplify the structure by omitting a coil spring member for applying a force to the release button, And the structure is simplified by omitting the holder.

It is still another object of the present invention to provide a buckle device having a wing plate and a buckle body, which can reliably prevent the wing plate from being disengaged from the buckle body in an emergency in a vehicle emergency state, And a simple structure that does not release the blade plate from the buckle main body in the event of an emergency in a vehicle.

It is a further object of the present invention to provide a buckle device which is configured to pull the buckle main body in the direction of close contact by the pretensioner to reliably prevent the release plate from disengaging from the buckle body by the operation of the pretensioner, So as not to detach the blade plate.

That is, according to the first aspect of the present invention, in a buckle device comprising a buckle body to which a rake plate and a rake plate are detachably connected to a safety belt, when a buckle body is inserted into a frame and a rake plate rotatably provided on the frame, A releasing button made of a synthetic resin for releasing the engagement between the hook member and the rake plate, and a hook member when engaged with the rake plate To the first position for restricting the rotation of the hook member in the release direction and to the second position for pushing the release button in the release disengagement operation of the release button to allow rotation in the disengaging direction of the hook member When the lock bar is moved to the first position as an urging force of the urging member, There is provided a lock bar device integrally formed with a release button for stopping and stopping the lock bar against an urging force.

In the buckle device according to the present invention, when the blade plate is inserted into the buckle body, the hook member rotates together with the insertion of the blade plate to engage with the blade plate, and the locking bar is biased by the biasing member in the second position Position to inhibit the hook member from rotating in the disengaging direction. When the release button is unlocked when releasing the blade plate, the locking bar is switched from the first position to the second position so that the hook member rotates in the disengaging direction to disengage the blade plate to disengage from the blade plate.

However, according to the present invention, when the locking plate is moved from the second position to the first position by the urging force of the urging member at the time of inserting the blade plate, the stop regulating member for stopping the locking bar against the urging force is integrally Therefore, when the locked bar is switched from the second position to the first position, the stopper portion of the synthetic resin is stopped to stop. Therefore, no impact sound is generated between the metal members, and only a low quiet collision sound Occurs.

The buckle device according to the present invention is characterized in that the buckle main body is pressed by the blade plate when the blade plate is inserted to rotate the hook member in the engaging direction and has a spring member for applying a force to the ejector and the ejector in the direction of departing the blade plate The ejector can be brought into contact with the release button by the spring force of the spring member to push the ejector in the releasing direction of the release plate.

Further, when the blade plate is inserted, the ejector is pushed by the blade plate to rotate the hook member in the engaging direction, thereby coupling the hook plate and the hook member.

Since the ejector according to the present invention is applied with a force in the releasing direction of the blade plate by the spring member, when ejecting the blade plate, the ejector comes into contact with the release button by the biasing force of the spring member and pushes it in the releasing direction of the blade plate. As described above, since the spring member for pushing the release button in the releasing direction in order to press the release button in the releasing direction of the release plate can be omitted by utilizing the spring member that applies the force to the ejector, The pedestal can also be omitted.

Further, in the buckle device according to the present invention, the frame includes a base plate part, a pair of side plate parts standing on the base part and facing in opposite directions to each other, Wherein the lock bar is inserted into a pair of long holes and mounted on the pair of side plate portions, and the stop restriction portion includes a pair of side plates, And a pair of supporting portions for supporting both ends of the locking bar projecting outward from the supporting portion.

As described above, since the locking bars are inserted into the pair of side plate portions by being inserted through a pair of elongated holes formed in the pair of side plate portions of the frame, when the both ends of the locking bar are stable and the locking bar is in the first position, It is possible to suppress the rotation in the direction of engagement. In addition, since the stopping restricting portion is a receiving portion for receiving both ends of the locking bar protruding outward from the pair of side plate portions, it is possible to secure the operational stability when the locking bar is supported at the first position.

In the buckle device according to the present invention, a stopper part may be formed integrally with the frame so that the release button is engaged with the biasing force of the biasing member for applying a force to the locking bar.

When the lock bar is changed from the second position to the first position by the urging force of the biasing member at the time of inserting the brake plate and is supported by the stop regulating portion formed integrally with the release button, The release button can be firmly held by the stopper portion formed integrally with the frame.

Further, in the buckle device according to the present invention, the locking bar is formed of a strip-type member, and the release button includes a pair of the pair of side plates, And guide wall parts. The guide wall portion may be formed with a pair of guide grooves for guiding both ends of the locking bar projecting from the pair of side plate portions.

Since the lock bar according to the present invention can be formed as a member in the form of a plate piece, both ends thereof are inserted through a pair of elongated holes and guided to the pair of guide grooves, So that the release button can be guided movably through the pair of guide grooves.

A pair of guide wall parts and a guide groove prevent the locking bar from moving in the major axis direction so that the frame is prevented from deviating from the pair of slots. The frame and the pair of long holes and the locking bar can be controlled in the moving direction of the release button by preventing the release button from being released from the locked position through the pair of guide wall portions and the pair of guide grooves. As a result, the structure related to the lock bar and the structure related to the release button can be constructed very simply.

Further, in the buckle device according to the present invention, each of the guide grooves has a closed groove at both ends in the longitudinal direction, and the end portions of the locking bars are fixed to the respective guide wall portions in the direction perpendicular to the guide grooves, The introduction opening may be formed.

Therefore, when the buckle device is assembled, the end portion of the locking bar is introduced into the intermediate portion of the guide groove in the longitudinal direction at the introduction opening portion, so that the release button can be easily constructed. As a result, if the introduction opening is formed at an appropriate position so as not to correspond to the position of the locking bar at the first position or the second position, the risk of the locking bar being released from the introduction opening can be excluded.

According to a second aspect of the present invention, there is provided a buckle device having a buckle body connected to a seat belt, and a buckle body to which the buckle is inserted and detached, the buckle body comprising: a frame; A release button for releasing the engagement with the hook member; a release button for releasing the engagement with the hook member; a release button for releasing the engagement with the hook member when the release button is rotated; The hook member is prevented from rotating in the disengaging direction when the hook member is in engagement with the blade plate and is moved to the urging force of the biasing member in the first position, And a lock bar which moves to the second position by allowing the lock bar to be rotated in the unlocking direction.

The buckle device according to the present invention further comprises a locking member mounted to rotate between the first position and the non-locking position, which is the locking position of the locking bar; A locking member for locking the locking member to an unlocked position, the locking member being rotatably supported by the frame; A first engaging portion formed at one end thereof; And a second engaging portion facing the first engaging portion, the engaging portion being spaced apart from the first engaging portion by a clearance that allows the locking bar to be retracted, wherein the first engaging portion is in contact with the first position- And the second engaging portion engages in the moving region of the locking bar to face close to the locking bar.

When the wing plate according to the present invention is inserted into the buckle body, the hook member rotates and moves together with the insertion of the wing plate to engage with the wing plate, and the locking bar is switched from the second position to the first position by the biasing force of the biasing member Thereby suppressing the rotation in the direction in which the hook member is disengaged. The locking member is mounted such that the proximal end rotates freely with the frame, and the elastic force is applied to the non-locking position by the biasing member in the normal state.

Therefore, when the locking bar moves from the second position to the first position, the locking bar does not act at all with the second engaging portion, and the first position side end of the locking bar contacts the first engaging portion, It can be rotated. When the locking bar is moved to the first position, the locking member is in the locked position and the locking bar is received between the first engaging portion and the second engaging portion so that the first position side end of the locking bar is engaged with the first engaging portion And the second engaging portion is moved into the moving region of the locking bar so as to face close to the locking bar.

On the other hand, when the release button is operated to release the release plate from the buckle main body, the lock bar is switched from the first position to the second position to rotate in the direction in which the rotationally urged hook member is disengaged, So that the blade plate can be released. In the state in which the push plate is inserted, the second engaging portion is protruded into the moving region of the locking bar so as to face close to the locking bar. However, when the locking bar starts to move from the first position to the second position, So that the locking member biased by the biasing member rotates to the non-locking position. Since the switching of the locking bar from the first position to the second position is a manual operation, it can not be performed at a high speed and the locking member moves to the second position without contacting the second engaging portion.

However, when an inertial force in the first positional direction acts on the locking bar when a vehicle emergency occurs, the biasing force of the biasing member applies pressure to the locking member in addition to the inertial force, so that the locking position is reliably maintained. On the other hand, when the inertial force acts on the second position of the locking bar, the locking bar starts to move toward the second position. As described above, in the state where the blow plate is inserted into the buckle body, the first position side end portion of the locking bar contacts the first engaging portion to maintain the locked position, and the second engaging portion enters the moving region of the locking bar, The locking bar that starts to move toward the second position is supported as the second engaging portion so that the movement of the locking bar to the second position can be suppressed. As a result, it is possible to reliably prevent the release of the hook plate from disengaging from the buckle body.

Further, when the inertial force in the first position direction acts on the locking bar due to the collision impact during the vehicle emergency or when the vehicle is in an emergency in the vehicle, the buckle main body is pulled toward the side where it is tightly contacted by the pretensioner And the inertia force acts in the direction of the second position when the pretensioner is actuated or when the buckle body is suddenly stopped after the action of the pretensioner.

Furthermore, in a general vehicle collision, the posture of the occupant is rapidly displaced, and the hands and the elbow or the like accidentally come into contact with the release button of the buckle device, so that the hook member and the brake plate are disengaged from each other sometimes.

However, according to the present invention, even if the release button is depressed due to the above-mentioned emergency situation, the locking member inhibits the locking bar from moving in the unlocking (second position) direction. That is, since the operation of the locking member is delayed with respect to the sudden movement of the locking bar, the locking bar inhibits the rotation of the hook member in the disengaging direction and prevents the hook member from being disengaged from the blade plate .

In the above-described buckle device, the base end part of the locking member can be supported on the frame and rotated at a position apart from the plane including the moving area of the locking bar on the opposite side of the hook member.

Therefore, the first position-side end of the locking bar moving to the first position can push the first engaging portion to reliably move the locking member to the locked position and hold it in the locked position.

Further, according to a second aspect of the present invention, there is provided a buckle device comprising a buckle body connected to a safety belt and a buckle body to which a buckle is inserted and removed, and a buckle body Wherein the buckle body comprises: a frame; A hook member which rotates at the time of insertion of the blade plate rotatably provided in the frame and is engaged with the blade plate and biased in the direction of disengagement; The hook member is moved to the first position for restricting the rotation of the hook member in the disengaging direction when the hook member is engaged with the blade plate and is pressed by the release button at the release disengagement operation of the release button, And a locking bar that moves to a second position that allows rotation in the disengaging direction, wherein the locking bar restrains movement of the locking bar in the first position to the second position and rotates freely over the non- A locking member for pivotally rotating on the frame and a biasing member for applying an elastic force to the locking member in the direction of the non-locking member, wherein the locking member includes a first engaging portion, And a second engaging portion protruding into the moving region of the locking bar and capable of contacting the second position side end portion of the locking bar when the locking bar is in the locked position, The lock bar biased to the first position is brought into contact with the first engaging portion to rotate the lock member to the locked position so that the inertia force generated when the buckle body is suddenly stopped after the operation of the pretensioner causes the second The lock bar that starts to move toward the position side is received by the second engaging portion to stop the movement of the lock bar to the second position.

In a normal state in which the pretensioner does not operate, the first position side end portion of the locking bar contacts the first engaging portion when the knocking plate is inserted into the buckle body, so that the locking member can be rotated and held in the locked position. In this state, the second engaging portion projects into the moving region of the locking bar. When the pretensioner is actuated in a vehicle emergency, the buckle body retracts in the direction of tightening the seat belt tightly. Immediately thereafter, an inertial force acts on the locked bar in the first positional direction. At this time, the locking bar applies pressure to the locking member by an inertial force added in addition to the biasing force of the biasing member, so that it can be reliably held in the locked position.

On the other hand, when the buckle device is suddenly stopped, the lock bar receives the inertia force and starts moving to the second position. In the state in which the swing plate is inserted into the buckle main body, since the locking member is held in the locked position and the second engaging portion enters the moving region of the locking bar as described above, the locking bar, which has started to move toward the second position, The part stops the movement with the resistance force, and the movement of the locking bar to the second position can be suppressed. As a result, it is possible to reliably prevent the detachment of the blade plate from the buckle main body. Other than the above, the actions other than when the vehicle is in an emergency are almost the same as those described above.

In the buckle device according to the second aspect of the present invention, when the buckle body is suddenly stopped after the pretensioner is operated after the locking member freely rotates on the frame through the eccentric pivot portion from the center of gravity, And an inertial force rotating to the locked position side may act.

That is, when the buckle body is suddenly stopped, the locking member can be reliably held in the locked position, so that the locking bar that has started to move toward the second position can be surely received and stopped using the second engagement portion.

At this time, when the buckle body is suddenly stopped after the pretensioner is operated, the mass of the locking member or the locking bar, the urging force of the biasing member, and the urging force of the locking member are adjusted so that the locking bar can be held in the locked position by pressing the locking member The pivot position can be set.

Further, in the buckle device according to the second aspect of the present invention, the second engagement portion of the locking member may be configured to generate a rotational force to rotate the locking member in the locked position direction by contact with the locking bar moving toward the second position.

Therefore, even if the second engaging portion of the locking member does not fully interfere with the moving region of the locking bar, when the locking bar, which has started to move to the second position, comes into contact with the second engaging portion, . As a result, even if the second engaging portion is not completely interposed in the moving region of the locking member, if the locking bar that starts moving toward the second position makes contact with the second engaging portion, the locking member can be reliably rotated to the locked position have. As a result, the second engaging portion can be completely interposed in the moving region of the locking bar, and the locking bar can be reliably received and stopped by the second engaging portion.

According to a third aspect of the present invention, there is provided a buckle device comprising a buckle body having a buckle body connected to a seat belt and a buckle body to which the buckle is inserted and removed, Wherein the body of the buckle comprises: a frame; A hook member rotatably provided on the frame and rotated when the blade plate is inserted to engage with the blade plate and to be constantly biased in the unlocking direction; A release button for releasing the engagement between the hook member and the blade plate; When the release button is in the engaged state, the hook member is moved to the first position inhibiting the hook member from rotating in the disengaging direction, and when the release button is disengaged, the release button is pressed by the release button, The hook member being rotatable between a locked position in which the hook member in engagement with the hook member is locked so as to be disengageable and a non-locked position in which the hook member in engagement with the hook plate is disengageable, The lock lever is pivotally pivoted to the frame through a pivot part eccentric from the center of the lock lever so that the lock lever is pivoted freely on the frame and the movement of the buckle body Immediately after the start, the locking lever receives the inertia force and rotates to the locked position, A buckle consisting of a bar is locked at the time of receiving the force of inertia so as to suppress the rotation of a non-locking position in the locking position of the lock lever to move to the second position is provided.

When the blade plate is inserted into the buckle body, the hook member rotates to engage with the blade plate when the blade plate is inserted, and the locking bar is moved from the second position to the first position by the urging force of the urging member, Direction. When releasing the release button, when the release button is disengaged, the locked bar is moved from the first position to the second position and the rotationally urged hook member rotates in the disengaging direction to disengage from the wheel plate, There is a number.

In the normal condition that the pretensioner does not operate, the locking lever is always in the unlocked position. However, in the event of a vehicle emergency, the pretensioner operates to cause the buckle body to be pulled in the tightening direction of the seat belt and then suddenly stop. However, immediately after the buckle body starts to move, the locking lever receives the inertial force and rotates to the locked position, At the time of a sudden stop, the locking bar receives the inertia force and moves to the second position, whereby the locking lever is inhibited from rotating from the locked position to the unlocked position. After the operation of the pretensioner, the locking lever is returned to the first position by the urging member, whereby the locking lever is rotated in the direction of the non-locking position, and as a result, returns to the normal state.

If the locking lever is not provided, there is a possibility that the locking bar is moved from the first position to the second position due to the inertia force when the buckle body is suddenly stopped, and the hook member is disengaged to release the knocking plate from the buckle main body. So that even if the locking bar moves to the second position, the locking bar inhibits the locking lever from rotating from the locked position to the unlocked position. As a result, it is possible to reliably prevent the release plate from detaching from the buckle main body.

Furthermore, the structure of the lock lever or the like can prevent the blade plate from being detached from the buckle body by the operation of the pretensioner, which is advantageous in terms of manufacturing cost. Further, when the buckle body is suddenly stopped, the locking bar receives the inertia force and moves to the second position, but the locking bar can be elastically stopped by the urging member, so that the locking bar does not break or deform, .

The buckle device according to the present invention is also characterized in that a contact portion for holding the lock lever in the lock position is formed at the tip end portion of the lock lever by contacting the lock bar moved to the second position at the time of emergency stop of the buckle main body. That is, when the buckle body is suddenly stopped, the lock bar moved to the second position comes into contact with the contact portion of the lock lever, and the lock lever is held in the locked position and can be surely prevented from rotating to the unlocked position.

In addition, in the buckle device, the locking lever preferably includes an inclined guiding part for receiving a rotational force from the locking bar to the locking position in the locking position. As a result, when the locking lever is moved from the locked position to the unlocked position, the locking bar, which moves to the second position, comes into contact with the inclined guide portion of the locking lever and receives the rotational force toward the locked position. So that it can be maintained.

In the above-described buckle device, it is preferable that the center of the locking lever is provided so as to rotate the locking lever in the direction of the locked position by an inertial force acting on the center of the locking lever when the buckle body is moved. As a result, the locking lever can be reliably rotated to the locked position by the inertia force acting immediately after the buckle main body starts to move.

Further, in the buckle device according to the present invention, the locking lever may include a first lever and a second lever rotatable about a common axis, so that, when the buckle body starts moving during operation of the pretensioner, The second lever is pushed to rotate to the locked position and the second lever is held to the locked position side by the inertial force when the buckle body stops suddenly.

In the buckle device according to the present invention, immediately after the buckle main body starts to move, the second lever is pushed to the locked position by the first lever rotating by inertia force, and when the buckle body is suddenly stopped, the second lever is locked by the inertial force Position. As a result, when the buckle main body suddenly stops, the lock bar moves to the second position, and the rotation of the second lever from the locked position to the unlocked position is more reliably suppressed, thereby reliably preventing the release of the brake plate from the buckle main body.

Hereinafter, the shape of the buckle device according to the first invention of the present application will be described in detail with reference to the drawings.

BACKGROUND ART A seat belt device of a vehicle is provided with a buckle device for connecting a seat belt mounted on an occupant to a vehicle body side. The buckle device 1 shown in Figs. 1 to 7 will be described by defining the front, rear, left and right as shown in Fig. 1, with the direction of the arrow A as the front for convenience of explanation. As shown in Figs. 1 to 3, the buckle device 1 basically comprises a tongue plate 2 and a buckle body 2 mounted movably in the middle of a safety belt (not shown) and an insert port 6 for inserting the wing plate 2 is provided at the front end of the buckle device 1. [

The wing plate 2 has a metal tongue part 3 inserted into the buckle body 5 and a tongue body 3 integrally formed with the wing body 3 and covered with a synthetic resin material a rectangular engaging hole 3a is formed in the barrel 3 and a safety band passage hole 4b is formed in the barrel main body portion 4 a rectangular passage hole 4a is formed.

1 to 3, the buckle body 5 includes a frame 10, a hook member 20, a lock bar 30, an ejector 40, A plastic release button 50, compressed coil springs 60 and 61 and a buckle device 1 fixed by a rivet 62 to the frame 10 are mounted on a vehicle body side An anchor member 63 for fixing to the fixing portion of the base member 64, a base cover 64 made of synthetic resin, and a lid cover 65. The member other than the synthetic resin member is made of metal (for example, made of steel).

The frame 10 is integrally formed with a base portion 11 and a pair of side plate portions 12 that stand up at both right and left side edges of the base portion 11. [ The base portion 11 is provided with a round hole 13 for the rivet 62 and a compression coil spring 61 for applying an elastic force to the ejector 40 in the forward direction and for guiding the movement of the ejector 40 A spring connecting portion (not shown) protruding from the rear edge of the quadrangular hole 14 and an inclined portion 15 joined to the base cover 64 are formed.

The pair of side plate portions 12 are provided with a pair of elongated holes 16 for inserting both end portions of the locking bars 30 to freely guide the sliding in the forward and backward directions and a pair of elongated holes 16 for pivoting the hook members 20 A pair of notch pivot parts 17 and a pair of stopper parts 18 for preventing the release button 50 from slipping forward and a pair of stopper parts 18 for guiding the removal of the blade plate 2, A pair of guide projections 19 are formed to prevent twisting of the blade plate 2 upon insertion.

1 to 3, the hook member 20 includes a restriction part 22 having a shape curved upward in front of a main body part thereof, A hook portion 23 which can be bent so as to be engageable with the vane portion 3 and whose front end portion can be fitted into the front end portion of the quadrangular hole 14 of the base plate portion 11 and a pair of right and left pivots A pair of operated parts 25 bent downward from the rear end of the main body part and operated by the ejector 40 and a pair of to-be-operated parts 25 And a spring receiving part 26 that is bent upward between the upper and lower parts.

A pair of left and right pivoted parts 24 are rotatably mounted on a pair of notched pivot parts 17 of the pair of side plate parts 12 so that the hook member 20 is rotated up and down by a predetermined angle .

1 to 3, the locking bar 30 is a member in the form of a plate piece, and the locking bar 30 has a pair of elongated holes 16 And the left and right end portions of the locking bar 30 protrude from the side plate portion 12 by about 2 to 3 mm in the attached state, The locking bar 30 can be moved forward and backward by a predetermined distance along the pair of long holes 16. A spring receiving portion 31 is formed in a protruding shape at the center of the rear end portion of the locking bar 30 and is inserted between the spring receiving portion 26 of the hook member 20 and the spring receiving portion 31 of the locking bar 30 The coil spring 60 is fitted in the compressed state so that the locking bar 30 is urged forward and the hook member 20 is moved in the direction in which the hook portion 23 is moved upward (in the direction of releasing the engagement with the blade plate 2) I always get the power.

When the knife plate 2 is inserted into the buckle body 5 and engaged with the hook member 20, the locking bar 30 is positioned at the first position corresponding to the front end portion of the pair of long holes 16 The locking bar 30 is prevented from rotating in the direction of disengagement by the releasing button 50 when the releasing button 50 is disengaged by depressing the regulating portion 22 to prevent the hook member 20 from rotating in the disengaging direction And is located at a second position corresponding to the rear end portion of the pair of long holes 16 to be retracted more than the restricting portion 22 to allow the hook member 20 to rotate in the disengaging direction.

1 to 3, the ejector 40 includes an inclined guiding part 41 at its front end, a guided part 42 at both ends of the left and right ends, An operating part 43 for rotating the pair of to-be-operated parts 25 of the hook member 20 backward when inserting the blade plate 2 to rotate the hook member 20 in the engaging direction, A pair of left and right pushing parts 44 and a spring connection part 46 connected to the front end of the coil spring 61 for pushing the release button 50 forward when the release button 20 is released, And so on. The ejector 40 guides the frame 10 so that it can freely move forward and backward on the base 11 of the frame 10 so that the pair of top faces 42 do not lift by engaging with both ends of the square holes 14.

One end of the coil spring 61 is connected to the spring connection portion 46 so that the lower end of the coil spring 61 is connected to the spring connection portion of the base portion 11. In this way, The elastic force is applied to the frame 10 in the forward direction (i.e., in the direction in which the blade plate 2 is released) by the activation force of the frame 10.

1 to 4, the release button 50 includes a front end wall part 51 and a pair of left and right guide wall parts 52 And an upper end wall 53 at the upper end. The pair of guide wall portions 52 are located on the outer side of the pair of side plate portions 12 of the frame 10 and are provided on the pair of guide wall portions 52 on the outer side of the pair of long holes 16 A pair of guide grooves 54 facing each other and a pair of guide grooves 54 for guiding both ends of the locking bar 30 in a freely movable manner are formed.

The front end of the guide groove 54 is located slightly behind the front end of the long holes 16 in the state in which the release button 50 is in the advance limit position And each guide wall portion 52 has a receiving portion 55 formed at the front end edge of the guide groove 54 and supporting the end portion of the locking bar 30 moved from the second position to the first position Respectively. The pair of support portions 55 formed on the pair of guide wall portions 52 is a stop restricting part formed entirely on the release button 50 and the lock bar 30 is engaged with the coil spring 60, The stopper rests against the urging force of the lock bar 30 when the lock bar 30 is moved to the first position.

The upper surface portion 53 of the release button 50 is provided with a pair of stopper portions 18 of the pair of side plate portions 12 of the frame 10 for allowing the release button 50 to move back and forth A pair of slits 56 are formed and the locking bar 30 is moved from the second position to the first position by the biasing force of the coil spring 60 when the blade plate 2 is inserted, The pair of engaged parts 57 at the rear end of the pair of slits 56 are stopped by the pair of stoppers 18 when the release button 50 is supported by the pair of stoppers 55, Stop at position.

On the inner surface of the front end wall portion 51 of the release button 50 is brought into contact with a pair of pushing parts 44 of the ejector 40 when the blade plate 2 is detached from the buckle main body 5, A pair of pushed parts 58 to be pushed are formed and the ejector 40 which is urged by the biasing force of the coil spring 61 when the blade plate 2 is released from the buckle body 5, The release button 50 is returned to the forward limit position and the ejector 40 is stopped by pushing the release button 50 forward (to the release side of the blade plate) together with the blade plate 2.

The ejector 40 receives the elastic urging force of the coil spring 61 and presses the release button 50 forward so that the ejector 40 is spaced slightly from the front end of the rectangular hole 14 formed in the frame 10 And stops.

As described above, the anchor member 6 is fixed to the frame 10 with a rivet 62 inserted therebetween, and the hook member 20 (not shown) is attached to the frame 10, as shown in Figs. The lock bar 30, the ejector 40 and the release button 50 are fitted to the coil springs 60 and 61 so as to be accommodated in the base cover 64 and the lid cover 65 The base cover 64 and the lid cover 65 are integrated in a fixed state with a plurality of fitting portions and a coupling portion interposed therebetween. The front end of the release button 50 is opposed to the front end of the buckle device 1 and the front end of the release button 50 is pressed with a finger so that the release button 50 can be pushed.

Next, the operation of the buckle device 1 described above will be described.

5 shows a state in which the wing member 20 is engaged with the wing plate 2 in which the wing portion 3 of the wing plate 2 is inserted and the hook portion 23 is engaged with the wing member 20 3 and the rectangular hole 14 of the frame 10 so as to engage the hook portion 3 with the engaging groove 3a. The locking bar 30 is located at the first position and contacts the upper surface of the restricting portion 22 of the hook member 20 to inhibit the rotation of the hook member 20 in the disengaging direction, The engaging parts 57 of the pair of stoppers 50 are hooked by the pair of stopper parts 18 so that the release button 50 is stopped at the forward limit position.

Both ends of the locking bar 30 are brought into contact with the receiving portion 55 of the release button 50 so that the release button 50 is in contact with the locking bar 30 receiving the urging force of the coil spring 60, As shown in FIG.

6, when the release button 50 is pressed against the biasing force of the coil spring 60 with the finger and moved backward, as shown in Fig. 6, when the wing plate 2 is released from the buckle main body 5, The left and right ends of the bar 30 press the left and right pair of receiving portions 55 of the release button 50 backward so that the locking bar 30 moves to the second position together with the release button 50, The hook member 20 is rotated in the disengaging direction with the spring receiving portion 26 of the hook member 20 therebetween.

7, when the locking bar 30 reaches the second position, the locking bar 30 moves further rearward than the restricting portion 22 and does not contact the restricting portion 22, so that the hook member 30 20 are rotated upward as much as possible to come to a disengaged state. The wing plate 2 is released from the buckle body 5 in the forward direction in this unlocking state. At this time, the front end of the ejector 40 is displaced forward by the force of the wing plate 2. Since the pair of pressing portions 44 of the ejector 40 contact the pair of pressing portions 44 of the release button 50 and the pair of pressing portions 58 of the release button 50, When the release button 50 is released from the button 50, a force is exerted by the applied force of the coil spring 61. As the release button 50 is forwardly pushed by the ejector 40 and the release button 50 advances Quot;

When the wing plate 2 is inserted into the buckle body 5 and connected to the wing plate 2 in the released state, the wing portion 3 of the wing plate 2 is inserted into the ejector The pair of operating portions 43 on the rear side of the ejector 40 are moved in the direction of the hook member 61 by pushing the ejector 40 by inserting the blade plate 2 against the applied force of the coil spring 61, The hook member 20 is rotated in the engaging direction against the applied force of the coil spring 60 as shown in Fig. 5, 3, and the locking bar 30 advances from the second position to the first position.

When the lock bar 30 is moved from the second position to the first position, the lock bar 30 rapidly moves to the first position by the applied force of the coil spring 60, Since the locking bar 30 is engaged with the pair of receiving portions 55 (stopper restricting portions) formed on the pair of guide wall portions 52 of the release button 50, No impact noise due to the collision of the metal members due to collision with the pedestal portion 55 is generated, and only a quiet collision noise lower than the impact noise due to the collision between the metal members is generated. Therefore, it is possible to lower the noise in the vehicle interior and to improve the sense of operation when the blade plate 2 is engaged.

It is possible to press the release button 50 and the blade plate 2 in the blade releasing direction (forward direction) by utilizing the coil spring 61 that applies the force to the ejector 40 when the blade plate 2 is released It is possible to omit the spring member for pushing the release button 50 in the releasing direction of the blade plate. As a result, a pair of spring bearings for supporting both ends of the spring member can be omitted, the number of members can be reduced, the structure is simplified, and the buckle device 1 is easily assembled.

Since the locking bar 30 is inserted into a pair of elongated holes 16 of the pair of side plate portions 12 of the frame 10 and attached to the pair of side plate portions 12, The rotation of the hook member 20 in the disengaging direction can be reliably suppressed when the support for supporting the both ends of the hook 30 is stable and the locking bar 30 is at the first position. Since the stopping restricting portion is a pair of receiving portions 55 for receiving both ends of the locking bar 30 protruding outward from the pair of side plate portions 12, The operation safety can be ensured.

The stopper portion 18 which engages with the release button 50 against the urging force of the coil spring 60 which applies the force to the locking bar 30 is integrally attached to the pair of side plate portions 12 of the frame 10 Even when a force is applied to the releasing button 50 from the locking bar 30 in the releasing direction of the releasing plate at the time of inserting the reel plate 2 into the metal frame 10, The release button 50 can be surely caught by the stopper portion 18 and the stopper portion 18 can be formed simply and inexpensively so as to form the stopper portion 18 in the frame 10 as a whole.

The locking bar 30 is a member in the form of a plate piece and both ends of the locking bar 30 are inserted into the pair of slots 16 and guided as a pair of guide grooves 54, It is possible to guide the release button 50 so as to be movable by putting a pair of guide grooves 54 therebetween. As a result, the locking bar 30 can be prevented from moving in the longitudinal direction by the pair of guide wall portions 52 and the guide grooves 54, It can be regulated not to deviate from the elongated hole 16 of the base plate.

The release button 50 is locked by placing the pair of guide wall portions 52 and the pair of guide grooves 54 therebetween by the frame 10 and the pair of long holes 16 and the lock bar 30. [ It is possible to regulate the movement of the release button 50 so as not to deviate from the bar 30, thereby regulating the moving direction of the release button 50. Thus, for example, it is possible to omit a holder member holding the locking bar 30 or omit a spring member for urging the release button 50 forward, The structure relating to the button 50 can be extremely simplified.

Next, modified examples in which the above embodiment is partially changed will be described.

1) a front end wall part 51 or an upper end wall 53 of the release button 50 is provided instead of a pair of receiving parts 55 formed on the release button 50, A stop restriction part may be formed as a whole.

2, each guide wall portion 52A of the release button 50 is extended rearward so that each guide wall portion 52A faces the outside of the slot 16 with the same length as the slot 16 Both ends in the longitudinal direction of the guide groove 54A are locked and an end of the locking bar 30 is inserted into the guide groove 54A in the direction perpendicular to the guide groove 54A An introducing opening 54A for introducing the gas into the intermediate portion in the longitudinal direction of the gasket 54 is formed.

The dimension D in the drawing is formed to be larger than the half of the width B of the locking bar 30. Since the introduction opening 54A is formed so as to be connected to the midway portion in the longitudinal direction of the guide groove 54A so as not to coincide with the first and second positions of the locking bar 30 and the dimension D is set to 0.5 x B At least half of the locking bar 30 overlaps the guide wall portion 52A even when the locking bar 30 is in the second position, for example, before assembly (before the cover is attached) It is extremely difficult to escape from the guide groove 54A, and the handling property before the cover attachment is improved.

9, a pair of stopper portions 65a instead of the pair of stopper portions 18 are formed in a projecting state on the inner surface of the lid cover 65, And a pair of engaged parts 57 of the release button 50 are engaged and operated as a pair of stopper parts 65a.

4) The structure of the buckle device 1 is merely an example, and various modifications may be added to each member in a range not departing from the gist of the present invention.

Next, an embodiment of the buckle device according to the second invention of the present application will be described with reference to the drawings.

The seat belt device of the present invention is provided with a buckle device unique to the present invention for connecting a seat belt mounted on a vehicle occupant to the side of the vehicle body and a pretensioner for retracting the buckle body of the buckle device to draw the seat belt in a state of emergency in a vehicle emergency state have. The buckle device 1 shown in Figs. 10 to 17 will be described by defining front, rear, left and right with the arrow A direction as the front as shown in Fig. 10 for convenience of explanation.

10 to 12, the buckle device 1 basically comprises a wing plate 2 and a buckle body 5 which are movably mounted on the intermediate portion of a safety belt (not shown) And an insertion port 6 for inserting the blade plate 2 is provided at the front end portion of the buckle main body 5. The wing plate 2 has a tongue body 4 integrally formed with a metallic wedge 3 inserted into the buckle body 5 and covered with a synthetic resin material and the wing 3 has a rectangular Engaging holes 3a are formed in the tongue body 4 and a webbing passage hole 4a is formed in the tongue body 4. [

10 to 12, the buckle body 5 includes a frame 10, a hook member 20, a locking bar 30, an ejector 40 made of synthetic resin, a release button 50 made of synthetic resin, A locking member 73 for connecting the buckle main body 5 fixed by the rivet 72 to the pretensioner on the frame 10 of the compression coil spring 70, A base cover 74, a lid cover 75, and the like.

The synthetic resin member is made of metal (e.g., steel). Moreover, the locking member 95 is preferably made of a synthetic resin, and may also be made of metal. Further, the buckle body 5 may be connected to the pretensioner by interposing a member other than the connecting member 73 therebetween.

The frame 10 is integrally formed with a base portion 11 and a pair of side plate portions 12 standing from left and right sides of the base portion 11. [ The base portion 11 accommodates a circular hole 11a for the rivet 72 and a compression coil spring 71 for applying an elastic force to the ejector 40 forward, A spring connection portion (not shown) protruding from a rear end surface of the quadrangular hole 11b and an inclined portion 11c engaged with the base cover 74 are formed .

The pair of side plate portions 12 are provided with a pair of long holes 12a through which both ends of the locking bar 30 are inserted so as to slide in the forward and backward directions and a notched pivot portion for supporting the hook member 20 to freely rotate a pair of stopper portions 12c for preventing the release button 50 from slipping forward and a stopper portion 12c for guiding the insertion and removal of the blade plate 2 while guiding the pivot portion 12b of the blade plate 2 And a pair of guide projections 12d for preventing twisting are formed.

The pair of side plate portions 12 are provided with a pair of axial holes 15 for inserting and supporting both ends of a left and right axial member 95 inserted through the locking member 90, And the right side plate portion 12 is provided with a torsion spring 96 for attaching one end of a torsion spring 96 for applying a rotational force to the lock member 90 to the lower side of the shaft groove 15 A spring mounting hole 110 is formed.

10 to 13, the hook member 20 includes a body portion 21, a restricting portion 22 which is upwardly curved upwardly in an upward direction in the body portion 21, The engaging hole 3a of the wing plate 2 bent downward in the restricting portion 22 and the engaging hole 3a of the engaging hole 3a can be inserted into the front end of the quadrangular hole 11b of the distal end base portion 11, A pair of left and right pivot portions 24 of the hook portion and a pair of operated portions bent downward at the rear end of the main body portion 21 and operated as the ejector 40 and a spring receiving portion 26 which is bent upward between these portions 25 to be operated. A pair of right and left pivoted parts 24 are rotatably mounted on a pair of notch pivot parts 12b of the pair of side plate parts 12 so that the hook member 20 can rotate up and down at a predetermined angle .

10 to 12, the locking bar 30 is a piece-shaped member. The locking bar 30 is inserted into a pair of long holes 12a The left and right end portions of the locking bar 30 protrude from the side plate portion 12 to the outside of the side plate portion 12 by about 2 to 3 mm in the attached state, Are movable forward and backward a predetermined distance along the pair of long holes 12a. A spring receiving portion 31 is formed in a protruding shape at the center of a rear end portion of the locking bar 30 so that the spring receiving portion 26 of the hook member 20 and the spring receiving portion 31 of the locking bar 30 So that the locking bar 30 is urged forward and the hook member 20 is rotated in the direction in which the hook member 23 is disengaged from the upper side (disengagement from the blade plate 2) Direction) is always applied.

In the state where the tongue plate 2 is inserted into the buckle body 5 to be coupled to the hook member 20, the locking bar 30 has a first portion corresponding to the front end portion of the pair of long holes 12a, (Upper direction) of the hook member 20 is stopped by pushing the regulating portion 22 from the upper position, and when the release button 50 is released, Is pushed rearward by the release button 50 to be located at a second position corresponding to the rear portion of the pair of long holes 12a and to be retracted further than the restricting portion 22 to be engaged with the hook member 20 in the disengaging direction of the hook member 20 Allow rotation.

10 to 12, the ejector 40 has an inclined guide portion 41 at the front end thereof, a guided portion 42 at both left and right ends thereof, an insertion portion 42 of the blade plate 2, A pair of operating portions 43 for pushing the pair of to-be-operated portions 25 of the hook member 20 backward to rotate the hook member 20 in the engaging direction, A pair of right and left pressing portions 44 for pressing the release button 50 forward and a spring connecting portion 46 connected to the front end of the coil spring 71 are provided. The ejector 40 is arranged to move back and forth on the base portion 11 of the frame 10, Type, and So that the mold does not float by engaging with both side surfaces of the quadrangular hole 11b.

The front end of the coil spring 71 is connected to the spring connection portion 46 in an insertion manner so that the rear end of the coil spring 71 is connected to the spring connection portion (not shown) of the base portion 11, Is urged forward by the biasing force of the coil spring 71 with respect to the frame 10 (that is, the releasing direction of the blade plate 2).

10 to 12, the release button 50 includes a front end wall part 51 and a pair of left and right guide wall parts 51, 52 and an upper end wall portion (upper end wall portion) 53 are provided. The pair of guide wall portions 52 are located close to the outside of the pair of side plate portions 12 of the frame 10 and the pair of guide wall portions 52 are provided on the outside of the pair of long holes 12a And a pair of guide grooves 54 for guiding the forward and backward movement of both end portions of the locking bar 30 protruding from the both ends thereof are formed.

The front end of the guide groove 54 is positioned slightly rearward than the front end of the slot 12a in the state in which the release button 50 is at the forward limit position (positions in FIGS. 11 and 12) Each guide wall portion 52 is provided with a support portion 55 formed at the front end edge of the guide groove 54 and supporting the end portion of the locking bar 30 moved from the second position to the first position Is formed.

The pair of support portions 55 formed on the pair of guide wall portions 50 are provided with the stopper portions formed as a whole in the release button 50 so that the lock bars 30 are prevented from being displaced by the urging force of the coil spring 70 1 position, a stop regulating portion for supporting the locking bar 30 against the urging force thereof is formed.

The top wall portion 53 of the release button 50 is provided with a pair of stopper portions 12c of the pair of side plate portions 12 of the frame 10 for allowing the release button 50 to be moved back and forth. A pair of slits 56 are formed and the locking bar 30 is moved from the second position to the first position by the urging force of the coil spring 70 at the time of inserting the blade plate 2, Engaged parts 57 of the rear ends of the pair of slits 56 are engaged with the pair of stopper parts 12c and the release button 50 is engaged with the stopper part 12c, Is stopped at this advance limit position.

The inner surface of the front end wall portion 51 of the release button 50 comes into contact with the pair of pressing portions 44 of the ejector 40 to be pressed forward when the wing plate 2 is released from the buckle body 5 (Not shown) is formed to release the release button 50 from the buckle body 5 by the ejector 40 biased by the biasing force of the coil spring 71 The eject button 40 is pushed forward (toward the releasing plate releasing side) together with the blade plate 2 to return the release button 50 to the forward limit position and the ejector 40 stops.

Even in this state, the ejector 40 receives a slight urging force of the coil spring 71 and a slight gap is formed between the front end of the rectangular hole 11b formed in the frame 10 so as to press the release button 50 forward Leave and stop.

Hereinafter, the locking member 90 will be described. 10 to 13, the locking member 90 includes a base end part 91 extending in the left-right direction and disposed between the pair of side plate parts 12 of the frame 10, And a pair of lever portions 92 extending substantially rearward at both left and right ends of the lever portion 92. The proximal end portion 91 is a horizontal portion 91b connecting the pair of side plate portions 91a at the left and right ends with the upper portion of these side plate portions 91a.

A pair of pivot portions 91c eccentrically downward from the center of the pair of locking members 90 are concentrically formed and the shaft member 95 is inserted into these pivot portions 91c. Both ends of the shaft member 95 are inserted into the pair of shaft holes 15 so that the proximal end 91 of the locking member 90 is rotatably supported on the plate 10 with the shaft member 95 interposed therebetween Pivoted.

The proximal end 91 of the locking member 90 is integrally formed with a rib 91d at a position close to the right side plate portion 91a. A passage hole (not shown) through which the shaft member 95 is inserted is formed in the rib 91d. A torsion spring 96 (elastic member) is disposed between the side plate portion 91a and the rib 91c facing each other and the shaft member 95 is inserted into the torsion spring 96. [ One end of the torsion spring 96 is mounted in contact with the lower portion of the horizontal portion 91b of the locking member 90 and the other end is connected to the spring attachment hole of the frame 10. 110 so that the lever portion 92 is always urged upward by the torsion spring 96. As a result, Moreover, the rib 91d may be omitted.

The locking member 90 is provided at a distal end portion of a pair of first engaging parts 93 and a pair of lever parts 92 provided near the proximal end 91, And the pair of second engaging portions 94 facing the pair of first engaging portions 93 with a sufficient clearance so as to receive the locking bars 30, (Refer to Figs. 15 and 16) for pivoting so as to freely rotate with respect to each other, and an elastic force is always applied to the non-lock position side by the torsion spring 96. [

The first engaging portion 93 is provided so that the first position side end portion (front end portion) of the locking bar 30 can be brought into contact with the first engaging portion 93. When the locking bar 30 is in the second position The first engaging portion 93 is positioned slightly behind the front end of the moving region of the locking bar 30 so that the locking portion 90 is locked as described above, The portion other than the first engaging portion 93 including the second engaging portion 94 of the member 90 does not intervene in the moving region of the locking bar 30. [

The proximal end 91 of the locking member 90 is positioned at a position opposite to the hook member 20 on the surface including the moving region of the locking bar 30, And is pivoted to the frame 10 at a position above the skew. Thus, the locking bar 30 biased to the first position is brought into contact with the first engaging portion 93 to rotate the locking member 90 to the locked position. In this state, the first engaging portion 93 The locking bar 30 contacts and maintains the locked position. The second engaging portion 94 protruding into the moving region of the locking bar 30 can be brought close to and in contact with the second position side end (rear end) of the locking bar 30 do.

17, the second engaging portion 94 of the locking member 90 is rotated by the rotation of the locking member 90 toward the locked position due to the contact with the locking bar 30 moving toward the second position The locking member 90 is formed in a shape inclined forward and downward in a state of being positioned in the vicinity of the locked position.

An inertial force acts on the buckle body 5 (locking member 90) backward at the time of sudden stop of the buckle main body 5 after the operation of the pretensioner, but the inertia force acting on the center G of the locking member 90 (Rotation axis) of the locking member 90 so as to rotate the locking member 90 in the direction of the locked position.

10 to 12, the hook member 20, the locking bar 73 and the locking member 73 are fixed to the frame 10 with the rivet 72 interposed therebetween, The ejector 40, the release button 50 and the locking member 90 and the coil springs 70 and 71 are brought into contact with each other so that the base cover 74 and the cover 75 cover the plurality of fitting portions And are integrated in a fixed state with a coupling portion interposed therebetween. The front end of the release button 50 is opposed to the front end of the buckle device 1 and the front end of the release button 50 is pressed with a finger so that the release button 50 can be pushed.

Hereinafter, the operation and effects of the buckle device 1 described above will be described in detail. 13 shows a state in which the blade plate 2 is detached from the buckle body 5 and a force is applied to the lock member 90 by the torsion spring 96 in the unlocked position. In this state, when the buckle 3 of the blade plate 2 starts to be inserted into the buckle main body 5 at the insertion opening 6, the buckle 3 first comes into contact with the front end of the ejector 40.

When the ejector 40 is pushed by inserting the blade plate 2 again against the urging force of the coil spring 71, the pair of operating portions 43 at the rear end of the ejector 40 are pushed by the hook member 20 The hook member 20 is rotated in the engaging direction against the urging force of the coil spring 70 to rotate the engaging portion 3 And the locking bar 30 is moved forward from the second position to the first position by the biasing force of the coil spring 70. As a result,

When the locking bar 30 moves from the second position to the first position, the locking member 90 is in the unlocked position and the second engaging portion 94 does not intervene in the moving region of the locking bar 30 , The locking bar 30 does not interfere with the second engaging portion 94 and the first position side end portion of the locking bar 30 contacts the first engaging portion 93 as shown in Fig. The locking member 90 is rotated to the locked position. The locking bar 30 is received between the second engaging portions 93 and 94 and the first position side end portion of the locking bar 30 is brought into contact with the first engaging portion 93 in this state, So that the second engaging portion 94 enters the moving region of the locking bar 30 and is directed toward the locking bar 30 toward each other.

In addition, when the knurling portion 3 of the wing plate 2 is inserted into the buckle body 5 and the wing portion 23 is engaged with the hook member 20, And engages with the coupling hole 3a and the hook portion 3 coupled to the rectangular hole 11b of the frame 10. The locking bar 30 is located at the first position and contacts the upper surface of the restricting portion 22 of the hook member 20 to regulate the rotation of the hook member 20 in the disengaging direction, A pair of operated parts 57 of the release button 50 are respectively coupled to the stopper part 12c and the release button 50 is stopped at the forward limit position. Both ends of the locking bar 30 are brought into contact with the pair of receiving portions 55 of the release button 50 so that the release button 50 is locked in the locked state receiving the urging force of the coil spring 70 A force is applied further forward than the bar 30.

When the release button 50 is moved backward by pressing the finger against the biasing force of the coil spring 70 to release the blade plate 2 from the buckle main body 5, Since the locking bar 30 is moved to the second position together with the release button 50 and the coil spring 70 is compressed because the locking bar 30 is pushed rearward by the pair of right and left support portions 55 of the hook member 50, The hook member 20 is rotated in the disengaging direction with the spring support portion 26 of the spring member 20 interposed therebetween.

In this state, when the blade plate 2 is inserted, the second engaging portion 94 protrudes into the moving region of the locking bar 30 so that the locking bar 30 faces the locking bar 30, The locking bar 30 is separated from the first engaging portion 93 so that the locking member 90 biased by the torsion spring 96 is rotated to the non-locking position side . Since the switching of the locking bar 30 from the first position to the second position is not performed at a high speed due to the manual operation, since the locking bar 30 is rotated from the non- And moves to the second position without coming into contact with the second contact portion 94.

13, when the locking bar 30 reaches the second position, since the locking bar 30 moves rearward beyond the restricting portion 22 and does not contact the restricting portion 22, (20) rotate to the maximum extent in both directions to be in a disengaged state. And the wing plate 2 is released forward from the buckle body 5 in this unlocking state. At this time, since the front end of the ejector 40 is in contact with the rear end of the blade plate 2, the blade plate 2 is forced forward and separated.

Thus, when the fingers are released from the release button 50 because the pair of pressing portions 44 of the ejector 40 contact the pair of pressure-sensitive portions 58 of the release button 50, The release button 50 is forwardly urged by the ejector 40 biased by the urging force so that the release button 50 returns to the forward limit position.

In the event of a vehicle emergency such as a vehicle collision, the pretensioner is operated so that the buckle body 5 is pulled in a predetermined amount in the direction in which the safety belt is tightened and the passenger is severely restrained by the seat belt. On the other hand, The locking member 90 or the like is operated so that the wing plate 2 is not detached from the buckle main body 5.

When the pretensioner is operated, the buckle body 5 is pulled in the direction of tightening the seat belt, that is, rearward, and then suddenly, but immediately after the buckle body 5 starts to move rearwardly of the buckle main body 5, the locking member 90 receives forward inertia force . At this time, the inertial force acts as a rotational force to rotate the locking member 90 to the unlocked position, but the inertial force in the first positional direction also acts on the locking bar 3, The pushing force of the coil spring 70 which applies the force to the first position allows the locking member 90 to be pressed and held in the locked position by the locking bar 30 so that the mass of the locking member 90 or the locking bar 30, A pivoting position of the locking member 90, and the like.

Then, when the buckle body 5 suddenly stops, the locking bar 30 receives the inertia force and starts to move in the second position direction. The locking member 90 is held in the locked position and the second engaging portion 94 is moved into the moving region of the locking bar 30 in the state in which the wing plate 2 is inserted into the buckle body 5 The locking bar 30 which has started to move to the second position is received as the second engaging portion 94 and the movement of the locking bar 30 to the second position It is possible to prevent the detachment of the blade plate 2 from the buckle main body 5.

Here, the locking member 90 is a pivot part that is eccentric from its center of gravity, and is freely rotatable about the frame 10 with a shaft member When the buckle body 5 is suddenly stopped after the operation of the pretensioner, the locking bar 30, which starts to move to the second position side, is actuated by the inertia force rotating on the locking member 90 toward the locking position side, It can be surely received by the engaging portion 94.

Since the locking member 90 is formed so as to generate the rotational force to rotate the locking member 90 in the locked position direction by the contact with the locking bar 30 that moves the second engagement portion 94 of the locking member 90 to the second position side, Even if the second engaging portion 94 of the member 90 does not completely intervene in the moving region of the locking bar 30, the locking bar 30 that starts to move to the second position side in the second engaging portion 94 The locking member 90 can be reliably rotated to the locked position. That is, the second engaging portion 94 can be completely interposed in the moving region of the locking bar 90, and the locking bar 30 can be surely received by the second engaging portion 94.

Since the proximal end 91 of the locking member 90 is pivoted to the frame 10 at a position spaced away from the hook member 20 on the side including the moving region of the locking bar 30, The first engaging portion 93 is pushed by the first position side end of the locking bar 30 to reliably rotate the locking member 90 in the locked position to reliably maintain the locked position.

As described above, in the normal state except for the emergency of the vehicle, only the contact with the locking bar 30 at the time of inserting the wing plate 2 is hardly involved in insertion and removal of the wing plate 2, The insertion and removal operations of the blade plate 2 can be realized.

Moreover, since the structure in which the blade plate 2 is not detached from the buckle main body 5 in a vehicle emergency can be realized as a simple structure composed of the lock member 90 and the torsion spring 96, the manufacturing cost is also extremely advantageous.

Further, after the operation of the pretensioner, the locking bar 30 is returned from the second position to the first position by the urging force of the coil spring 70, whereby the locking member 90 is held in the locked position, The operator can freely insert and detach the blade plate 2 with the buckle main body 5.

Next, a modified example of the above embodiment will be described. The pretensioner may be omitted and the connecting member 73 of the buckle body 5 may be interposed between the front body and the vehicle body. As a result, since the operation of the pretensioner and the subsequent inertia force according to the sudden stop of the buckle main body 5 are not received, but the inertia force acting by the impact force in an emergency such as a vehicle collision can realize the above operation, It is possible to reliably prevent the detachment of the blade plate 2 from the buckle main body 5. [

It is not necessarily required that the locking member 90 maintain its locked position by its inertia force when the buckle main body 5 is suddenly stopped after the operation of the pretensioner. As a result, it is preferable that at least the inertial force acting on the locking member 90 at the time of sudden stop of the buckle body 5 does not act as a rotational force to rotate the locking member 90 toward the non-locking position, The locking bar 30 may be brought into contact with the second engaging portion 94. In this case,

Moreover, it is also preferable that the locking member 90 be pivoted at a middle portion in the longitudinal direction. Furthermore, the structure of the buckle device 1 is merely an example, and various modifications may be added to the respective members within the scope of the present invention. The buckle device of the present embodiment is not limited to a seat belt device mounted on a vehicle such as an automobile, but is also applicable to a buckle device mounted on an airplane or a high-speed ship.

Next, an embodiment of a buckle device according to a third invention of the present invention will be described with reference to the drawings. The seat belt device of the present invention is provided with a buckle device unique to the present invention for connecting the seat belt mounted on the occupant to the vehicle body and a pretensioner for retracting the buckle device buckle main body in the direction of tightening the seat belt in order to tighten the seat belt . 18 to 24, the buckle device 1 will be described by defining the front, rear, left and right as shown in Fig. 18, with the direction of the arrow A forward.

18 to 20, the buckle device 1 basically comprises a wing plate 2 and a buckle body 5 that are movably attached to the intermediate portion of a safety belt (not shown) At the front end portion of the buckle body 5, an insertion port 6 for inserting the blade plate 2 is provided. The wing plate 2 has a tongue body 4 integrally formed with a metal-made buckle 3 inserted in the buckle body 5 and covered with a synthetic resin material. The tongue body 4 has a webbing passage hole 4a formed therein. The engaging hole 3a is formed in the barb 3.

18 to 20, the buckle main body 5 includes a frame 10, a hook member 20, a locking bar 30, an ejector 40 made of synthetic resin, a synthetic resin release button 50, A locking lever 73 fixed to the frame 10 by a rivet 72 to connect the buckle device 1 to the pretensioner, A cover 74, a lid cover 75, and the like. The members other than the synthetic resin member are made of metal (e.g., steel). Further, the buckle main body 5 may be connected to the pretensioner by interposing a member other than the connecting member 73 therebetween.

The frame 10 is formed by integrally forming a base portion 11 and a pair of side plate portions 12 rising from both left and right sides of the base portion 11. The substrate 11 is provided with a round hole 11a for the rivet 72 and a compression coil spring 71 for applying an elastic force to the front of the ejector 40, A spring connecting portion protruding from the rear end face of the quadrangular hole 11b and an inclined portion 11c engaging with the base cover 74 are formed.

The pair of side plate portions 12 are provided with a pair of long holes 12a for inserting both ends of the locking bar 30 to guide the slider in the forward and backward directions freely and a notch pivot portion A pair of stopper portions 12c and a pair of stopper portions 12c which perform a locking action so that the release button 50 and the release button 50 do not deviate forward can be guided by the twist of the blade plate 2 at the time of insertion a pair of guide protrusions 12d for preventing twisting is formed.

A pair of shaft grooves 13a are formed in the side plate back portion 13 of the pair of side plate portions 12 to support both ends of the shaft member 104 fixed in the locking lever 100 And the left side plate back portion 13 is formed with a spring mounting portion 13b for attaching one end portion of a torsion spring 105 for applying a rotational force to the locking lever 100 in both directions.

18 to 21, the hook member 20 includes a body portion 21 and a restricting portion 22 which is curved upward forward in the body portion 21 of the body portion 21, A hook portion 23 which is engageable with the engaging hole 3a of the blade plate 2 bent downward and whose distal end can be fitted to the front end of the quadrangular hole 11b of the base plate portion 11 and a pair of left and right pairs of hook portions A pair of to-be-operated portions 25 that are bent downward at the rear end of the main body portion 21 and are operated as the ejector 40 and the to-be-operated portions 25, The spring support portion 26 is provided. A pair of left and right pivot portions 24 are rotatably mounted on a pair of notched pivot portions 12b of the pair of side plate portions 12 so that the hook member 20 is rotatable up and down by a predetermined angle .

As shown in FIGS. 18 to 20, the locking bar 30 is a strip-type member, and the locking bar 30 includes a pair of long holes the locking bar 30 is moved in the forward and backward directions by a predetermined distance along the pair of long holes 12a in a state where the locking bar 30 is inserted into the long side slot 12a It is possible.

A spring receiving portion 31 is formed in a protruding shape at the center of the rear end of the locking bar 30 so that the spring receiving portion 26 of the hook member 20 and the spring receiving portion 31 of the locking bar 30 The coil spring 70 is fitted in a compressed state so that the locking bar 30 is urged forward so that the hook member 20 can be disengaged from the hook plate 23 in the upward direction The force is always applied.

The locking bar 30 is positioned at the first position corresponding to the front end portion of the pair of long holes 12a in a state where the wing plate 2 is inserted into the buckle body 5 and engaged with the hook member 20 The release button 30 is prevented from rotating in the disengaging direction (upward direction) of the hook member 20 by depressing the regulating portion 22 from the upper side, (50) is pushed rearward to be rotated at a second position corresponding to the rear end portion of the pair of long holes (12a) in such a direction as to retract further than the restricting portion (22) to disengage the hook member Allow.

18 to 20, the ejector 40 has an inclined portion 41 at the front end thereof, and at the time of insertion of the blade inside 42 and the blade plate 2 at both ends of the left and right ends, A pair of operating portions 43 for rotating the pair of to-be-operated portions 25 of the hook member 20 rearward to rotate the hook member 20 in the engaging direction, A pair of left and right pressing portions 44 for pressing the spring 50 forward, and a spring connecting portion 46 connected to the front end of the coil spring 71. The ejector 40 is configured so as to be movable back and forth on the base portion 11 of the frame 10 so that a pair of to-be-guided portions 42 are guided without being damaged by engagement with both sides of the quadrangular hole 11b .

The front end of the coil spring 71 is connected to the spring connecting portion 46 in a thrust manner and the rear end of the coil spring 71 is connected to a spring connecting portion (not shown) of the base portion 11. As a result, the ejector 40 is urged forward by the urging force of the coil spring 71 to the frame 10 (that is, the releasing direction of the blade plate 2).

18 to 20, the release button 50 has a front end wall portion 51 at the front end, a pair of guide wall portions 52 at the left and right, an upper end wall portion 53 at the upper end, . The pair of guide wall portions 52 are respectively located close to the outside of the pair of side plate portions 12 of the frame 10 and the pair of guide wall portions 52 protrude outward from the pair of long holes 12a A pair of guide grooves 54 for guiding both end portions of the lock bar 30 forward and backward are formed.

The front ends of the guide grooves 54 are located slightly behind the front end of the slot 12a in the state in which the release button 50 is at the forward limit position (positions in Figs. 19 and 20) The guiding wall portion 52 is formed at the front end edge of the guide groove 54. Further, a receiving portion 55 for receiving the end portion of the locking bar 30 moved from the second position to the first position is formed. The pair of support portions 55 formed on the pair of guide wall portions 52 is a stop restricting portion formed integrally with the release button 50 and the lock bar 30 is a portion of the coil spring 70 The stopper rests against the locking bar 30 when it moves to the first position by force.

A pair of right and left pairs of left and right pairs of left and right pairs of right and left pairs of left and right pairs of right and left A slit 56 is formed so that the locking bar 30 is moved from the second position to the first position by the biasing force of the coil spring 70 when the blade plate 2 is inserted, When the release button 50 in which a pair of engaged parts 57 at the rear end of a pair of slits 56 are coupled as a pair of stopper parts 12c when the stopper part 55 is supported as the stopper part 55, .

The pair of pushing portions of the ejector 40 contacting the pair of pressing portions 44 to be pressed forward is formed on the inner surface of the front end wall portion 51 of the release button 50 when the wing plate 2 is released from the buckle body 5 The release button 50 is rotated by the ejector 40 biased by the urging force of the coil spring 71 to release the release button 50 from the buckle body 5 when the blade plate 2 is detached from the buckle body 5. [ The ejector 40 is stopped by pushing it forward (toward the release side of the blade plate) together with the plate 2 and returning the release button 50 to the forward limit position. The ejector 40 receives a slight urging force of the coil spring 71 and pushes the release button 50 forward so that the ejector 40 is slightly displaced from the front end of the rectangle hole 11b formed in the frame 10 Leave the interval and stop.

The locking lever 100 will be described. 18 to 21, the locking lever 100 includes a base portion on an ellipse axis in the left-right direction disposed between a pair of side plate rear portions 13 (side plate back portion) 13 of the frame 10, ; And a pair of lever portions 102 extending substantially forward from both left and right ends of the base portion 101. A pivot portion 101a is formed in the base portion 101 at a position eccentric from the center of the locking lever 100. The pivot portion 101a is provided with a shaft member 104 as a pivot portion, Is fixed in a spiral shape.

Both ends of the pivot portion 104 are inserted into the pair of shaft grooves 13a so that the locking lever 100 rotates about the pair of side plate back portions 13 with the shaft member 104 interposed therebetween It is freely pivoted. A notched part 101b is formed in the cut portion of the base 101 so as not to interfere with the spring receiving portion 26 of the hook member 20. [

A pair of holding parts 102a is formed at the front lower end of the pair of left and right lever parts 102. The lever part 102 has a front end portion including the pressing part 102a, (See Figs. 21 and 22) in which the wing plate 2 can be disengaged (allowing disengagement) and the hook member 20 in the engaged state with the wing plate 2 The pushing portion 102a is brought into contact with the rear slope portion of the restricting portion 2 so as to be rotatable relative to each other at a locked position (see Figs. 23 and 24) in which the hook member 20 can not be disengaged.

A spring portion 103 is formed at the rear end portion of the left lever portion 102 so that an end portion of the torsion spring 105 attached to the spring mounting portion 13b of the side plate back portion 13 And the other end is attached to the spring-loaded portion 103. By this torsion spring 105, a rotation force is always applied to the non-lock position side of the lock lever 100 above. Thus, in a normal state in which the pretensioner is not operated, the locking lever 100 is located in the non-locking position.

23 and 24, when the locking lever 100 is in the locked position, most of the upper surface portions other than the front end portion of the lever portion 102 are substantially aligned with the upper surface of the restricting portion 22 of the hook member 20 And a contact portion 102b capable of coming into contact with the locking bar 30 is formed at the front end portion of the upper surface portion. An inclined guide portion 102c is formed at the front end portion of the lever portion 102 and inclined downward in the skew direction from the front end of the contact portion 102b.

As a result, when the buckle main body 5 is moved backward during the operation of the pretensioner, the center G of the locking lever 100 of the buckle body 5 is moved by the inertia force acting on the center G of the locking lever 100 And is provided above the shaft member 104 to rotate the locking lever 100 in the direction of the locked position.

As described above, the connecting member 73 is fixed to the frame 10 with the rivet 72 interposed therebetween. The hook member 20, the locking bar (not shown) The ejector 40, the release button 50 and the locking lever 100 and the coil springs 70 and 71 come into contact with each other so that they are accommodated in the base cover 74 and the cover 75 Respectively.

In addition, the base cover 74 and the cover 75 are integrated in a fixed state with a plurality of fitting parts and engaging parts therebetween. The front end of the release button 50 is opposed to the front end of the buckle device 1 and the release button 50 can be pressed by pressing the front end of the release button 50 with a finger.

Next, the operation and effect of the buckle device 1 described above will be described. 22 shows a state in which the wing portion 2 of the wing plate 2 is inserted into the buckle body 5 and the hook member 20 is engaged with the hook portion 20. In this engaged state, Is engaged with the engaging hole 3a of the barrel portion 3 and the rectangular hole 11b of the frame 10 to engage the barrel portion 3. [

The locking bar 30 is located at the first position and contacts the upper surface of the restricting portion 22 of the hook member 20 and restrains rotation of the hook member 20 in the direction to disengage the hook member 20, The pair of to-be-engaged portions 57 of the release button 50 are engaged with the pair of stopper portions 12c, and the release button 50 is stopped at the forward limit position. Both ends of the locking bar 30 are brought into contact with the pair of receiving portions 55 of the release button 50 so that the release button 50 is in contact with the locking bar 30 which receives the biasing force of the coil spring 70 (30).

The release button 50 is pressed against the biasing force of the coil spring 70 by the fingers and moved backward so that the left and right ends of the lock bar 30 are released Since the locking bar 30 is moved to the second position together with the release button 50 and the coil spring 70 is compressed because the locking bar 30 is pushed rearward as a pair of left and right receiving portions 55 of the button 50, The spring receiving portion 26 of the hook member 20 is interposed therebetween to rotate the hook member 20 in the disengaging direction. 21, when the locking bar 30 reaches the second position, since the locking bar 30 moves rearward beyond the restricting portion 22 and does not contact the restricting portion 22, The member 20 rotates upward as much as possible and becomes in the disengaged state.

Since the front end of the ejector 40 is in contact with the rear end of the wing plate 2 at this time, the wing plate 2 is prevented from being pulled out of the buckle main body 5, The force is exerted forward. When the pair of pressing portions 44 of the ejector 40 are released from the release button 50 to contact the pair of pressure-sensitive portions 58 of the release button 50, The release button 50 is forwardly biased by the ejector 40 biased by the biasing force and the release button 50 is returned to the forward limit position.

21, when the wing plate 2 is inserted into the buckle body to be connected, the wing portion 3 of the wing plate 2 is inserted from the insertion port 6 to be engaged with the front end of the ejector 40 And pushes the ejector 40 by inserting the blade plate 2 against the biasing force of the coil spring 71. The pair of operating portions 43 at the rear end of the ejector 40 come into contact with the pair of to-be-operated portions 25 of the hook member 20 and are rotated backwardly so that the hook member 20 is rotated The locking bar 30 rotates in the contact direction against the urging force of the spring 70 and engages with the engaging hole 3a of the barb 3 to move the locking bar 30 from the second position to the first position.

However, in a normal state in which the pretensioner is not operated, the locking lever 100 does not participate in insertion and removal of the blade plate 2, but is always engaged with the torsion spring 105 in the non- The force is applied. However, in the event of a vehicle emergency such as a vehicle collision, the pretensioner operates and the buckle body 5 is drawn in a predetermined amount in the direction of tightening the seat belt, so that the occupant is severely restrained by the seat belt. Further, in the buckle device 1, the locking lever 100 or the like is operated so that the wing plate 2 is not detached from the buckle main body 5.

When the pretensioner is operated, the buckle body 5 is pulled to the sleeping side of the seat belt, that is, to the rear side, so that the locking lever 100 receives the front inertia immediately after the buckle body 5 starts to move backward. 22, since the center G of the locking lever 100 is positioned above the shaft member 104, the inertial force acting on the center G acts as a rotational force to rotate the locking lever 100 toward the locked position . 23, the locking lever 100 is rotated to the locked position so that the pair of pushing portions 102a of the locking lever 100 are brought into contact with the rear slanted surface portions of the restricting portions 22 of the hook member 20 do.

Then, when the buckle body 5 makes an emergency stop, the locking bar 30 receives the rear inertia force. This inertial force acts as a force to move the locking bar 30 to the second position and while the locking lever 100 does not rotate from the locked position to the unlocked position, And moves to the second position received at the time of emergency stop of the main body 5. [ The locking bar 30 moved to the second position is brought into contact with the contact portion 102b of the locking lever 100 to keep the locking lever 100 in the locked position, The rotation is stopped to the non-locked position.

After operation of the pretensioner, the locking bar 30 returns from the second position to the first position by the urging force of the coil spring 70. As a result, the locking lever 100 is rotated by applying the force from the locked position to the unlocked position by the torsion spring 105, returns to the normal state, and the passenger inserts the blade plate 2 into the buckle body 5 And can be freely performed.

When the lock lever 30 is not installed in this way, when the buckle body 5 makes a sudden stoppage, the locking bar 30 receives the rear inertia force and moves from the first position to the second position, The lock bar 30 is disengaged from the buckle main body 5 by releasing the lock lever 30 from the buckle main body 5 and the lock bar 2 is disengaged from the buckle main body 5, The rotation of the bar 30 from the locked position of the locking lever 100 to the unlocked position is inhibited and the detachment of the blade plate 2 from the buckle main body 5 can be reliably prevented.

In addition, since the wing plate 2 can be prevented from being detached from the buckle body 5 by the movement of the pretensioner with a simple structure of the locking lever 100 or the like, it is advantageous in terms of manufacturing cost. In addition, since the locking bar 30 receives the inertial force and moves to the second position when the buckle main body 5 suddenly stops, the coil spring 70 of the locking bar 30 can elastically support the locking bar 30, It is possible to perform normal operation without damaging or deforming the cover 30 or the like.

When the buckle body 5 suddenly stops at the tip end portion of the lever portion 102 of the locking lever 100, the locking bar 30 moved to the second position makes contact with the locking lever 100 to keep the locking lever 100 in the locked position The lock lever 30 can accurately hold the lock lever 100 in the lock position by the lock bar 30 so that the lock lever 100 can be surely prevented from rotating to the lock position.

The lever portion 102 of the locking lever 100 is provided with the inclined guide portion 102c which receives the rotational force from the locking bar 30 moving to the second position to the locked position side, When the lock lever 30 is moved to the unlock position or when the rotation of the lock lever 100 to the lock position is delayed at the start of movement of the buckle main body 5, the lock bar 30, which moves to the second position, Since the locking lever 100 receives the rotational force toward the locked position, the locking lever 100 can be forcibly rotated and held in the locked position.

Further, even if the locking bar 30 collides with the tip end portion of the locking lever 100 at the time of emergency stop of the buckle main body 5, the locking bar 30 is located at the first position, It is possible to prevent the hook member 20 from being disengaged from the blade plate 2 by the rotation of the lock bar 30 of the hook member 20. [

Next, a description will be given of a buckle device 1A according to another embodiment in which the locking lever 100 of the buckle device 1 is changed. However, the same reference numerals are given to the same components as those of the above-described embodiment, and a description thereof will be omitted.

As shown in Figs. 25 to 28, the locking lever 100A of the buckle 1A is provided with a first lever 80 and a second lever 85 which are rotatable about a common axis. The first lever 85 has a base portion 86 and a pair of levers 87. The pivot portion 86a is formed in the base portion 86 at a position eccentric from the center of the second lever 85 in the left- And a shaft member 104 as a pivot portion is fixed to the pivot portion 86a in an inserted state. The rear end portion of the first lever 80 is rotatably supported by the shaft member 104 so that the first lever 80 and the second lever 85 can rotate independently around the common axis.

The pressing portion 87a, the contacting portion 87b and the inclined guiding portion 87c are formed on the lever portion 87 of the second lever 85 so that the second lever portion 85 is press- (See Figs. 25 and 26) in which the front end portion is positioned above the slot 12a and the hook member 20 in engagement with the wing plate 2 is disengageable A locking position in which the pushing portion 87a is brought into contact with the upper surface of the front end of the main body portion 21 of the hook member 20 in the engaged state with the blade plate 2 to lock the hook member 20 in a non- , See Fig. 28).

The first lever 80 is formed with a pressing portion 80a which can be brought into contact with the upper surface of the second lever 85. The first lever 80 is rotatable together with the second lever 85 to the locked position, 2 can be rotated together with the lever 85 or independently to the unlocked position. Thus, the first lever 80 and the second lever 85 are urged in the direction of the non-locking position by the urging members (not shown), respectively. It is preferable that at least the second lever 85 is always urged to the non-lock position side by the biasing member.

When the buckle body 5 moves backward, the inertia force acts forward on the locking lever 100A. However, since the center G1 of the first lever 80 is located at the center of the first lever 80 The center G2 of the second lever 85 is provided on the upper side of the shaft member 104 to rotate the first lever 80 in the direction of the locked position due to the inertial force acting on the second lever 85, Is provided under the shaft member 104 so as to rotate the second lever 85 in the direction of the non-locking position by an inertial force acting on the center G2 of the second lever 85. [

When the buckle body 5 is moved backward, the rotational force for rotating the first lever 80 toward the locked position side by the inertial force acting on the first lever 80 acts on the inertial force acting on the second lever 85 The mass and center positions G1 and G2 of the first lever 80 and the second lever 85 are set so as to be larger than the rotational force for rotating the second lever 85 toward the non-lock position.

The operation and effect of the buckle device 1A will be described. Fig. 25 shows a state in which the wing plate 2 is detached from the buckle body 5, and Fig. 26 shows a state in which the wing plate 2 is inserted into the buckle body 5. As shown in Fig. In a normal state in which the pretensioner is not operated, the first lever 80 and the second lever 85 of the locking lever 100A are always exerted a force on the unlocked position.

However, in the event of a vehicle emergency such as a vehicle collision, the pretensioner operates to cause the buckle main body 5 to be pulled rearward and then suddenly stop. However, immediately after the buckle main body 5 starts moving backward, It receives forward inertia force. 26, since the center G1 of the first lever 80 is positioned above the axial member 104, the inertial force acting on the center G1 of the first lever 80 rotates the first lever 80 toward the locked position As shown in Fig.

On the other hand, since the center G2 of the second lever 85 is positioned below the shaft member 104, an inertia force acting on the center G2 acts as a rotational force to rotate the second lever 85 in the direction of the unlocked position . As described above, since the rotational force of the first lever 80 to the locked position side is set to be larger than the rotational force of the second lever 85 to the unlocked position side, The second lever 85 is pushed by the pressing portion 80a of the first lever 80 to rotate to the locked position. The pair of pushing portions 87a of the second lever 85 are brought into contact with the front upper end of the main body portion 21 of the hook member 20.

28, when the lock bar 30 receives an inertial force to the rear and the second lever 85 is not rotated from the locked position to the unlocked position during the sudden stop of the buckle main body 5, Moves from the first position to the second position against the urging force of the coil spring 70. At this time, since the inertia force acting on the center G2 of the second lever 85 serves as a force for holding the second lever 85 in the locked position, the second lever 85 is held by the inertia force toward the locked position The locking bar 30 moved to the second position is surely in contact with the contact portion 87b of the second lever 85 to hold the second lever 80 in the locked position. Moreover, when the buckle body 5 suddenly stops, the first lever 80 receives the inertial force and the biasing force and rotates to the unlocked position, but there is no problem.

As described above, the locking lever 100A has the first lever 80 and the second lever 85 which are rotatable about the common axis, and the inertia force The second lever 85 is pushed by the first lever 80 rotated by the first lever 80 to rotate to the locked position so that the second lever 85 can be maintained at the locked position by the inertia force when the buckle main body 5 is suddenly stopped. The lock bar 30 is moved to the second position at the time of sudden stop of the buckle main body 5 to more reliably inhibit the rotation of the second lever 85 from the locked position to the unlocked position, So that the blade plate 2 is reliably prevented from being dislocated. And other actions and effects similar to those of the above embodiments can be achieved.

Moreover, the buckle devices 1 and 1A are merely examples, and various modifications may be added to the respective members within the scope of the present invention.

According to the buckle device of the first aspect of the present invention, as described above, when the tongue plate is inserted, the lock bar is urged by the urging force of the urging member to the first position Since the stop restricting part for supporting the locking bar against the urging force is integrally formed with the release button made of synthetic resin, the locking bar is moved from the second position to the first position No impact sound is generated between the metal members due to being restrained by the stopper portion made of a synthetic resin when switching, and only the impact noise lower than the impact sound between the metal members and quiet is generated.

In the above-described buckle device, the spring member for pushing the release button in the releasing direction of the blade plate can be omitted by utilizing the spring member that applies the force of the ejector when releasing the blade plate, A pair of spring bearings for supporting both ends of the member can be omitted, so that the number of members can be reduced, the structure is simplified, and the assembling of the buckle device is simplified. Further, at the time of non-engagement of the blade plate, the release button is constantly subjected to the urging of the spring member, so that it can be kept in a stable state without generating rattling noise.

In addition, in the above-described buckle device, a locking bar is inserted into a pair of long holes forming a pair of slide plate parts of a flame and mounted on the pair of side plate parts, The support for supporting both ends of the locking bar is stable and the rotation of the hook member in the disengaging direction is reliably suppressed when the locking bar is in the first position. In addition, the stopper restricting portion can secure the operational stability when the both ends of the locking bar projecting outward from the pair of side plate portions are supported.

In addition, in the above-described buckle device, a stopper portion for engaging a release button against an urging force of the urging member for applying a force to the locking bar is provided on the frame The release button can be securely engaged with the stopper portion formed as a pair in the metal frame even if a force is applied to the releasing button from the locking bar in the releasing direction of the releasing plate at the time of inserting the releasing plate, the stopper part can be formed simply and inexpensively to form a pair of stopper parts in the frame.

Further, in the above buckle device, the locking bar is made of a strip-type member, both ends of which are inserted into a pair of slots and are guided by a pair of guide grooves, The pair of guide grooves can be interposed between both ends so that the release button can be movably guided. As a result, it is possible to restrict the locking bar from moving in the longitudinal direction by the pair of guide wall portions and the guide groove, so that the locking bar can be prevented from deviating from the pair of slots of the frame. The pair of guide walls and the pair of guide grooves can be interposed between the frame and the pair of slots and the locking bar so that the release button can be prevented from coming off the locking bar and the moving direction of the release button can be regulated. Thus, the structure related to the locked bar and the structure related to the release button can be extremely simplified.

In the above-described buckle device, each of the guide grooves is constituted by a groove having both ends in the longitudinal direction thereof closed, and an end portion of the locking bar is formed in each guide wall portion in the middle portion in the longitudinal direction of the guide groove in the direction perpendicular to the guide groove The release button can be easily attached by inserting the end part of the locking bar into the middle part of the guide groove in the longitudinal direction of the guide groove in the case of assembling the buckle device or the like . In addition, there is no risk that the end of the locking bar deviates from the introduction opening when the introduction opening is formed at an appropriate position so as not to correspond to the position of the locking bar at the first position and the second position.

According to the buckle device of the second aspect of the present application, the side end portion of the first position of the locking bar is in contact with the first engaging portion when the swinging plate is inserted into the buckle body, thereby rotating the locking member to the locked position, Since the second engaging portion is moved toward the moving region of the locking bar to be close to the locking bar while keeping the member in the locked position so that even if the locking bar starts to move to the second position due to the inertial force acting in the emergency situation of the vehicle, The locking bar can be received by the second engaging portion and the movement of the locking bar toward the second position can be suppressed. As a result, the hook member can be disengaged and reliably prevented from detaching from the buckle main body.

Further, in a steady state other than a vehicle emergency, the insertion and removal operations of the blade plate can be realized smoothly and reliably because the blade plate is hardly involved in the insertion and removal operations of the blade plate only by the contact with the locking bars at the time of inserting the blade plate. In addition, since the structure for not releasing the blade plate from the buckle main body in a vehicle emergency can be realized by a simple structure of a locking member and a biasing member, the manufacturing cost can be greatly reduced. In addition, when the blade plate is inserted, the locking bar, which moves to the first position by the urging force, can be supported elastically by interposing the first engaging portion so that the first engaging portion acts as a cushion, And the like can be reduced.

In the above-described buckle device, even if sudden movement of the locking bar occurs due to the sudden contact of the hand or elbow with the release button of the buckle device due to the occupant's posture, It is possible to secure a highly reliable buckle device since the release of the engagement between the hook member and the blade plate is prevented. In addition, the appearance of the buckle can be freely arranged.

In the above-described buckle device, when the frame is pivoted at a position spaced apart from the hook member on the surface including the moving region of the locking bar by the base end part of the locking member, The first engaging portion is pushed by the side end portion of the first position to reliably rotate the locking member to the locked position to securely maintain the locked position.

According to the buckle device of the second aspect of the present application, in a state in which the pre-tensioner does not operate, the first engaging portion is in contact with the side end portion of the first position of the locking bar in a state in which the re- The locking member is moved to the locked position and the second engaging portion is moved into the moving region of the locking bar. Therefore, the locking bar starts to move to the second position by the inertia force acting upon the sudden stop of the buckle main body after the operation of the pretensioner It is possible to suppress the movement of the locking bar to the second position by being supported by the second engaging portion protruding into the moving region of the locking bar, thereby reliably preventing the detachment of the brake plate from the buckle main body. In addition, it achieves almost the same effect as that of the buckle device described above.

Further, in the buckle device according to the second aspect of the present invention, the locking member is pivotally pivoted about the frame with the pivot portion eccentrically centered therebetween, so that the buckle body after the operation of the pretensioner is urged toward the locked position When the rotating inertial force is applied, the locking bar, which has started to move toward the second position, can reliably be supported by the second engaging portion.

In the buckle device according to the second aspect of the present invention, when the second engaging portion of the locking member is configured to generate a rotational force for rotating the second engaging portion toward the locked position, the second engaging portion of the locking member does not completely intervene in the moving region of the locking bar The locking member can be surely rotated to the locked position when the locking bar that starts to move to the second position is in contact with the second engagement portion. As a result, the second engaging portion can be completely inserted into the moving region of the locking bar, and the locking bar can reliably be supported by the second engaging portion.

According to the buckle device according to the third invention of the present application, in particular, it is possible to rotate the hook plate in a non-engageable position, And the lock lever is rotatably rotatable about the frame via the eccentric pivot portion at the center thereof so that the lock lever is in a state in which the lock lever is in contact with the inertia force immediately after the start of movement of the buckle body When the buckle body is suddenly stopped, the lock bar receives the inertia force and moves to the second position, and rotation of the lock lever from the locked position to the unlocked position can be suppressed.

As a result, if the locking lever is not provided, there is a possibility that the locking bar is moved from the first position to the second position by the inertia force when the buckle body is suddenly stopped, and the hook member is disengaged to release the knuckle plate from the buckle main body. However, Even when the locking bar is moved to the second position, the locking bar is prevented from rotating from the locked position to the unlocked position of the locked lever, thereby reliably preventing the release plate from being disengaged from the buckle main body. In addition, since a simple structure made up of a locking lever or the like can prevent the blade plate from being detached from the buckle body by the operation of the pretensioner, the production cost is advantageous. In addition, when the buckle body is suddenly stopped by the buckle body, the locking bar receives the inertia force and moves to the second position. However, since the locking bar can be elastically supported by the urging member, the locking bar can be normally operated without being damaged or deformed .

In the above-described buckle device, when the lock lever, which has moved to the second position at the time of emergency stop of the buckle main body, comes into contact with the tip end portion of the lock lever to form the contact portion holding the lock lever in the lock position, So that the locking lever can be surely prevented from rotating to the non-locking position.

In addition, in the above-described buckle device, when the locking lever is provided with the inclined guide portion which receives the rotational force toward the locked position in the locking bar moving to the second position, when the locking lever is moved from the locked position to the non- The locking lever comes into contact with the inclined guide portion of the locking lever and receives the rotational force toward the locked position, so that the locking lever can be forcibly rotated and held in the locked position.

Further, in the above-described buckle device, when the buckle body is moved so that the center of the lock lever is rotated in the direction of the locked position by the inertia force acting on the center of the lock lever, The lock lever can be reliably rotated from the lock lever to the lock position by the inertia force.

In the above buckle device, the locking lever may include a first lever and a second lever rotatable about a common axis, so that the inertia force is applied immediately after the start of movement of the buckle body during operation of the pretensioner When the second lever is pushed by the rotating first lever and is rotated to the locked position so that the second lever is held at the locked position side by inertia force when the buckle body is suddenly stopped, So that the rotation of the lock lever from the locked position to the unlocked position is more reliably suppressed, and it is possible to reliably prevent the release of the kick plate from the buckle main body.

Claims (16)

A buckle according to claim 1, wherein the buckle body (5) comprises a buckle body (2) and a buckle body (5) A frame 10; A hook member 20 which is rotated when the wing plate 2 is rotatably inserted into the frame to engage with the wing plate 2 and is always applied with a rotational force in a disengaging direction; A release button (50) made of a synthetic resin for releasing the engagement between the hook member (20) and the blade plate (2); (20) is moved to the first position for restricting the hook member (20) from rotating in the disengaging direction, and when the release button (50) is disengaged A locking bar that is pushed by a release button in operation and moves to a second position allowing the hook member (20) to be rotated in the disengaging direction And, The release button 50 is integrally formed with a stop regulating portion for supporting the locking bar 30 against the urging force when the locking bar 30 is moved to the first position by the urging force of the urging member . The buckle device according to claim 1, wherein the buckle device comprises an ejector (40) which is pushed by the blade plate (2) when the buckle body (5) is inserted into the blade plate (2) and rotates the hook member ; The ejector 40 is connected to a spring member (not shown) for applying a force in a direction in which the blade plate 2 is disengaged. Respectively, The releasing button 50 is brought into contact with the ejector 40 by the biasing force of the spring member when the wing plate 2 is released so that the release button 50 is pushed in the direction of disengaging the wing plate 2 . 3. The apparatus according to claim 1 or 2, wherein the frame (10) A substrate portion 11; A pair of side plate portions 12 rising from the base portion 11 and facing each other; And a pair of elongated holes 16 formed in the side plate portion 12 so that the locking bar 30 is inserted through the pair of elongated holes 16 and is projected outward from the pair of side plate portions 12, A pair of receiving portions 55 for receiving both ends of the receiving portion 30, And the buckle is provided with a buckle. The buckle device according to any one of claims 1 to 3, wherein the stopper part (18) for engaging the release button (50) against the biasing force of the biasing member for applying a force to the locking bar (30) Is formed integrally with the buckle. 4. The apparatus according to claim 3, wherein the locking bar (30) is a strip-type member, and as long as the release button (50) is located close to the outside of the pair of side plate parts And a pair of guide grooves 54 for guiding both ends of the locking bar 30 protruding from the pair of side plate portions 12 are formed on the guide wall portions 52 Characterized in that the buckle device. The buckle according to claim 5, wherein each of the guide grooves (54) has both ends in the longitudinal direction thereof closed, and each guide wall portion (52) And an introduction opening (54a) for introducing the guide groove (54) in the longitudinal direction of the guide groove (54) is formed. A buckle device (1) having a buckle body (1) having a wing plate (2) connected to a seat belt and a buckle body (5) A frame 10; A hook member 20 which is rotated when the blade plate 2 rotatably provided on the frame 10 is inserted to engage with the blade plate 2 and is constantly biased in the direction of disengagement; A release button (50) for releasing the engagement between the hook member (20) and the blade plate (2); And moves to the first position for restricting rotation in the disengaging direction of the hook member (20) when engaged with the blade plate (2), and is released by the release button (50) The locking bar 30 which is pushed by the button 50 and moves to the second position to allow the hook member 20 to rotate in the direction in which the hook member 20 is disengaged, And, The locking member 90 and the locking member 90 pushed in the frame 10 are allowed to rotate freely in the locked position for locking the locking bar 30 in the first position and the locking member 90 in the non- And a biasing member for biasing the biasing member, The locking member 90 is provided with a proximal end portion 91 supported on the frame 10, a first engaging portion formed at one end of the proximal end portion 91, And a second engaging portion 94 facing toward the portion 93, The first position side end portion of the locking bar 30 contacts the first engaging portion 93 to maintain the locked position while the second engaging portion 94 is in the locked position, (30), and enters into the moving region of the locking bar (30) and approaches the locking bar (30). The locking device according to claim 7, wherein the proximal end (91) of the locking member (90) is located at a position spaced apart from the plane including the moving region of the locking bar (30) (10). A buckle main body 5 for allowing the buckle plate 2 to be inserted into and pulled out from the buckle main body 5 in order to tighten the safety belt in an emergency in a vehicle, Wherein the buckle main body comprises: A frame 10; A hook member 20 which rotates when the wing plate 2 is rotatably inserted into the frame 10 to engage with the wing plate 2 and is urged to rotate in the unlocking direction at all times; A release button (50) for releasing the engagement between the hook member (20) and the blade plate (2); Moves to the urging force of the biasing member to the first position in which the hook member is prevented from rotating in the disengaging direction when engaged with the blade plate 2, A locking bar 30 which is pushed by a button 50 and moves to a second position for allowing the rotation of the hook member 20 in the disengaging direction, Respectively, A locking member 90 pivoted to the frame 10 so as to be freely rotatable with respect to each other at a locking position for restricting the locking bar 30 at the first position from moving toward the second position and a non- A biasing member for applying an elastic force to the locking member 90 toward the non-locking position is provided, The locking member 90 includes a first engagement portion 93 to which the first position side end portion of the locking bar 30 can contact and a second engagement portion 93 which protrudes into the moving region of the locking bar 30 when the locking bar 30 is in the locked position, And a second engaging portion 94 which can be brought into contact with the agitator 2 position side end portion, When the pretensioner is inoperative and in operation, the locking bar 30 biased to the first position contacts the first engaging portion 93 to rotate the locking member 90 to the locked position, The locking bar 30 which has started to move to the second position by the inertia force generated at the emergency stop of the locking bar 30 is stopped and supported by the second engaging portion 94 to suppress the movement of the locking bar 30 to the second position And the buckle unit is configured so as to be rotatable. 10. The locking device according to any one of claims 7 to 9, wherein the locking member (90) pivots on the frame (10) with a pivoting part pivoted off- , And an inertial force is applied to the locking member (90) to rotate to the locked position side when the buckle body (5) is suddenly stopped after the operation of the pretensioner. 11. The locking device according to any one of claims 7 to 10, wherein the second engaging portion (94) of the locking member (90) rotates the locking member (90) to the locked position side by contacting the locking bar (30) Wherein the buckle is configured to generate a rotational force to rotate the buckle. A buckle main body 5 connected to a seat belt and a buckle main body 5 in which the buckle plate 2 is inserted and removed so that the buckle main body 5 is retracted by the pre- The buckle device (1) according to claim 1, wherein the buckle body (5) A frame 10; A hook member 20 which rotates at the time of inserting the wing plate 2 provided to be rotatable in the frame 10 to engage with the wing plate 2 and to be always biased in the direction of disengagement; A release button (50) for releasing the engagement between the hook member (20) and the blade plate (2); Is moved by the urging force of the biasing member to the first position for restraining the hook member (20) from rotating in the disengaging direction when engaged with the blade plate (2) The locking bar 30 which is pushed by the button 50 and moves to the second position allowing the rotation of the hook member 20 in the disengaging direction, Respectively, A locking lever 100 is provided which is rotatable and is constantly biased toward the non-locked position over a locked position in which the knocking plate 2 and the hook member 20 in the engaged state are unlockably engaged So, The lock lever 100 pivots freely pivotally on the frame 10 with an off-center pivoting portion at a center of gravity therebetween, and in operation of the pretensioner, the buckle body 5 The locking lever 100 receives the inertial force and rotates to the locked position so that the locking bar 30 receives the inertia force at the time of sudden stop of the buckle main body 5 to move to the second position, So as to inhibit rotation from the locked position to the unlocked position. 13. The locking lever according to claim 12, wherein the locking bar (30) moved to the second position at the time of emergency stop of the buckle body (5) is brought into contact with the tip portion of the locking lever (100) And a contact portion (102b) is formed. The buckle device according to claim 13, wherein the locking lever (100) has an inclined guide portion (102c) receiving a rotational force from the locking bar (30) moving to the second position toward the locked position. The locking lever according to any one of claims 12 to 14, wherein the center of the locking lever (100) is an inertial force acting on the center of gravity of the locking lever (100) when the buckle body (5) And the buckle is rotated to rotate the buckle. 16. The locking device according to any one of claims 12 to 15, wherein the locking lever (100) has a first lever (80) and a second lever (85) rotatable about a common axis, The second lever 85 is pushed and rotated to the locked position by the first lever 80 rotated by the inertia force immediately after the start of the movement of the buckle body 5 and the second lever 85 ) Is held by the inertial force toward the locked position.